Conspiracy (criminal)

Last updated

In criminal law, a conspiracy is an agreement between two or more persons to commit a crime at some time in the future. [1] Criminal law in some countries or for some conspiracies may require that at least one overt act be undertaken in furtherance of that agreement, to constitute an offense. There is no limit on the number participating in the conspiracy and, in most countries, no requirement that any steps have been taken to put the plan into effect (compare attempts which require proximity to the full offense). For the purposes of concurrence, the actus reus is a continuing one and parties may join the plot later and incur joint liability and conspiracy can be charged where the co-conspirators have been acquitted or cannot be traced. Finally, repentance by one or more parties does not affect liability (unless, in some cases, it occurs before the parties have committed overt acts) but may reduce their sentence.


An unindicted co-conspirator, or unindicted conspirator, is a person or entity that is alleged in an indictment to have engaged in conspiracy, but who is not charged in the same indictment. Prosecutors choose to name persons as unindicted co-conspirators for a variety of reasons including grants of immunity, pragmatic considerations, and evidentiary concerns.

England and Wales

Common law offence

At common law, the crime of conspiracy was capable of infinite growth, able to accommodate any new situation and to criminalize it if the level of threat to society was sufficiently great. The courts were therefore acting in the role of the legislature to create new offences and, following the Law Commission Report No. 76 on Conspiracy and Criminal Law Reform, [2] the Criminal Law Act 1977 produced a statutory offence and abolished all the common law varieties of conspiracy, except two: that of conspiracy to defraud, and that of conspiracy to corrupt public morals or to outrage public decency.

Conspiracy to defraud

Section 5(2) of the Criminal Law Act 1977 preserved the common law offence of conspiracy to defraud. [3]

Conspiracy to defraud was defined in Scott v Commissioner of Police of the Metropolis per Viscount Dilhorne: [4]

"to defraud" ordinarily means … to deprive a person dishonestly of something which is his or of something to which he is or would or might but for the perpetration of the fraud be entitled. agreement by two or more [persons] by dishonesty to deprive a person of something which is his or to which he is or would be or might be entitled [or] an agreement by two or more by dishonesty to injure some proprietary right of his suffices to constitute the offence....

Conspiracy to corrupt public morals or to outrage public decency

Section 5(3) Criminal Law Act 1977 [5] preserved the common law offence of conspiracy to corrupt public morals or of conspiracy to outrage public decency.

Conspiracy to corrupt public morals is an offence under the common law of England and Wales. [6]

Conspiracy to outrage public decency is an offence under the common law of England and Wales. [7]

Section 5(1) of the Criminal Law Act 1977 does not affect the common law offence of conspiracy if, and in so far as, it can be committed by entering into an agreement to engage in conduct which tends to corrupt public morals, or which outrages public decency, but which does not amount to or involve the commission of an offence if carried out by a single person otherwise than in pursuance of an agreement. [8]

One authority maintains that conspiracy to "corrupt public morals" has no definitive case law, that it is unknown whether or not it is a substantive offence, and that it is unlikely that conspirators will be prosecuted for this offence. [9]

These two offences cover situations where, for example, a publisher encourages immoral behavior through explicit content in a magazine or periodical, as in the 1970 case of Knuller (Publishing, Printing and Promotions) Ltd v Director of Public Prosecutions, which ultimately was decided in 1973 by the House of Lords.

In the 1991 case of R v Rowley, [10] the defendant left notes in public places over a period of three weeks offering money and presents to boys with the intention of luring them for immoral purposes, but there was nothing lewd, obscene or disgusting in the notes, nor were they printed by a newsmagazine at the behest of Rowley, which would have invoked the element of conspiracy. The judge ruled that the jury was entitled to look at the purpose behind the notes in deciding whether they were lewd or disgusting. On appeal against conviction, it was held that an act outraging public decency required a deliberate act which was in itself lewd, obscene or disgusting, so Rowley's motive in leaving the notes was irrelevant and, since there was nothing in the notes themselves capable of outraging public decency, the conviction was quashed.

Statutory offence

This offence was created as a result of the Law Commission's recommendations in their Report, Conspiracy and Criminal Law Reform, 1976, Law Com No 76. This was part of the Commission's programme of codification of the criminal law. The eventual aim was to abolish all the remaining common law offences and replace them, where appropriate, with offences precisely defined by statute. The common law offences were seen as unacceptably vague and open to development by the courts in ways which might offend the principle of certainty. There was an additional problem that it could be a criminal conspiracy at common law to engage in conduct which was not in itself a criminal offence: see Law Com No 76, para 1.7. This was a major mischief at which the 1977 Act was aimed,[ citation needed ] although it retained the convenient concept of a common law conspiracy to defraud: see Law Com No 76, paras 1.9 and 1.16. Henceforward, according to the Law Commission, it would only be an offence to agree to engage in a course of conduct which was itself a criminal offence.

Section 1(1) of the Criminal Law Act 1977 provides:

if a person agrees with any other person or persons that a course of conduct shall be pursued which, if the agreement is carried out in accordance with their intentions, either –

(a) will necessarily amount to or involve the commission of any offence or offences by one or more of the parties to the agreement, or (b) would do so but for the existence of facts which render the commission of the offence or any of the offences impossible, [added by S.5 Criminal Attempts Act 1981]

he is guilty of conspiracy to commit the offence or offences in question.

Section 1A (inserted by the Criminal Justice (Terrorism and Conspiracy) Act 1998, s5) bans conspiracies part of which occurred in England and Wales to commit an act or the happening of some other event outside the United Kingdom which constitutes an offence under the law in force in that country or territory. Many conditions apply including that prosecutions need consent from the Attorney General.


  • Under section 2(1) the intended victim of the offence can not be guilty of conspiracy.
  • Under section 2(2) there can be no conspiracy where the only other person(s) to the agreement are:
    1. a spouse or civil partner; [11]
    2. a person under the age of criminal responsibility; or
    3. an intended victim of that offence.

Mens rea

There must be an agreement between two or more persons. The mens rea of conspiracy is a separate issue from the mens rea required of the substantive crime.

Lord Bridge in R v Anderson – quoted in R v Hussain said: [12]

an essential ingredient in the crime of conspiring to commit a specific offence or offences under section 1(1) of the Act of 1977 is that the accused should agree that a course of conduct be pursued which he knows must involve the commission by one or more of the parties to the agreement of that offence or those offences.

Lord Bridge in R v Anderson also said:

But, beyond the mere fact of agreement, the necessary mens rea of the crime is, in my opinion, established if, and only if, it is shown that the accused, when he entered into the agreement, intended to play some part in the agreed course of conduct in furtherance of the criminal purpose which the agreed course of action was intended to achieve. Nothing less will suffice; nothing more is required.

It is not therefore necessary for any action to be taken in furtherance of the criminal purpose in order for a conspiracy offence to have been committed. This distinguishes a conspiracy from an attempt (which necessarily does involve a person doing an act) see Criminal Attempts Act 1981.

Things said or done by one conspirator

Lord Steyn in R v Hayter said: [13]

The rule about confessions is subject to exceptions. Keane, The Modern Law of Evidence 5th ed., (2000) p 385–386, explains:

In two exceptional situations, a confession may be admitted not only as evidence against its maker but also as evidence against a co-accused implicated thereby. The first is where the co-accused by his words or conduct accepts the truth of the statement so as to make all or part of it a confession statement of his own. The second exception, which is perhaps best understood in terms of implied agency, applies in the case of conspiracy: statements (or acts) of one conspirator which the jury is satisfied were said (or done) in the execution or furtherance of the common design are admissible in evidence against another conspirator, even though he was not present at the time, to prove the nature and scope of the conspiracy, provided that there is some independent evidence to show the existence of the conspiracy and that the other conspirator was a party to it.


According to Edward Coke, conspiracy was originally a statutory remedy against false accusation and prosecution by "a consultation and agreement between two or more to appeal or indict an innocent man falsely and maliciously of felony, whom they cause to be indicted and appealed; and afterward the party is lawfully acquitted". [14] In Poulterer's Case , 77 Eng. Rep. 813 (K.B. 1611), the court reasoned that the thrust of the crime was the confederating of two or more, and dropped the requirement that an actual indictment of an innocent take place, whereby precedent was set that conspiracy only need involve an attempted crime, and that the agreement was the act, which enabled subsequent holdings against an agreement to commit any crime, not just that originally proscribed. [14]

Conspiracy to trespass

In Kamara v Director of Public Prosecutions, [15] nine students, who were nationals of Sierra Leone, appealed their convictions for conspiracy to trespass, and unlawful assembly. These persons, together with others who did not appeal, conspired to occupy the London premises of the High Commissioner for Sierra Leone in order to publicize grievances against the government of that country. Upon their arrival at the Commission, they threatened the caretaker with an imitation firearm and locked him in a reception room with ten other members of the staff. The students then held a press conference on the telephone, but the caretaker was able to contact the police, who arrived, released the prisoners, and arrested the accused. In this case the Court felt that the public interest was clearly involved because of the statutory duty of the British Government to protect diplomatic premises. Lauton J. delivered the judgment of the Court of Appeal dismissing the appeal from conviction. [16]

Conspiracy to corrupt public morals and conspiracy to outrage public decency

These offences were at one time tied up with prostitution and homosexual behaviour. After the Second World War, due to the fame of several convicts, the Wolfenden report was commissioned by government, and was published in 1957. Thereupon came the publication of several books, both pro and contra the report. Of these books we can isolate two representatives: Lord Devlin wrote in favour of societal norms, or morals, while H. L. A. Hart wrote that the state could ill-regulate private conduct. In May 1965, Devlin is reported to have conceded defeat. [17]

The Street Offences Act 1959 prohibited England's prostitutes from soliciting in the streets. One Shaw published a booklet containing prostitutes' names and addresses; each woman listed had paid Shaw for her advertisement. A 1962 majority in the House of Lords not only found the appellant guilty of a statutory offence (living on the earnings of prostitution), but also of the "common law misdemeanour of conspiracy to corrupt public morals". [18]

In the case of Knuller (Publishing, Printing and Promotions) Ltd v. D.P.P. which was decided 1973 in the House of Lords, [19] the appellants were directors of a company which published a fortnightly magazine. On an inside page under a column headed "Males" advertisements were inserted inviting readers to meet the advertisers for the purpose of homosexual practices. The appellants were convicted on counts of

  1. conspiracy to corrupt public morals, and
  2. conspiracy to outrage public decency.

The appeal on count 1 was dismissed, while the appeal on count 2 was allowed because in the present case there had been a misdirection in relation to the meaning of "decency" and the offence of "outrage". The list of cases consulted in the ratio decidendi is lengthy, and the case of Shaw v. D.P.P. [18] is a topic of furious discussion.

Conspiracy to effect a public mischief

In Withers v Director of Public Prosecutions, [20] which reached the House of Lords in 1974, it was unanimously held that conspiracy to effect a public mischief was not a separate and distinct class of criminal conspiracy. This overruled earlier decisions to the contrary effect. The Law Commission published a consultation paper on this subject in 1975. [21]

Conspiracy to murder

The offence of conspiracy to murder was created in statutory law by section 4 of the Offences Against the Person Act 1861.

Northern Ireland

Common law offence

See Conspiracy to defraud § Northern Ireland.

Statutory offence

See Part IV of the Criminal Attempts and Conspiracy (Northern Ireland) Order 1983 (S.I. 1983/1120 (N.I. 13)).

United States

Conspiracy has been defined in the United States as an agreement of two or more people to commit a crime, or to accomplish a legal end through illegal actions. [22] [23] A conspiracy does not need to have been planned in secret to meet the definition of the crime.

Conspiracy law usually does not require proof of specific intent by the defendants to injure any specific person to establish an illegal agreement. Instead, usually the law requires only that the conspirators have agreed to engage in a certain illegal act.

In most U.S. jurisdictions, for a person to be convicted of conspiracy, not only must he or she agree to commit a crime, but at least one of the conspirators must commit an overt act (the actus reus ) in furtherance of the crime. [24] However, in United States v. Shabani the U.S. Supreme Court ruled that this "overt act" element is not required under the federal drug conspiracy statute, 21 U.S.C. section 846.

The conspirators can be guilty even if they do not know the identity of the other members of the conspiracy. [25]

California criminal law is somewhat representative of other jurisdictions. A punishable conspiracy exists when at least two people form an agreement to commit a crime, [26] and at least one of them does some act in furtherance to committing the crime. [27] Each person is punishable in the same manner and to the same extent as is provided for the punishment of the crime itself. [26]

One example of this is the Han twins murder conspiracy case, where one twin sister attempted to hire two youths to have her twin sister killed.

One important feature of a conspiracy charge is that it relieves prosecutors of the need to prove the particular roles of conspirators. If two persons plot to kill another (and this can be proven), and the victim is indeed killed as a result of the actions of either conspirator, it is not necessary to prove with specificity which of the conspirators actually pulled the trigger. (Otherwise, both conspirators could conceivably handle the gun, leaving two sets of fingerprints and then demand acquittals for both, based on the fact that the prosecutor would be unable to prove, beyond a reasonable doubt, which of the two conspirators pulled the trigger.) A conspiracy conviction requires proof that (a) the conspirators did indeed conspire to commit the crime, and (b) the crime was committed by an individual involved in the conspiracy. Proof of which individual it was is usually not necessary.

It is also an option for prosecutors, when bringing conspiracy charges, to decline to indict all members of the conspiracy (though the existence of all members may be mentioned in an indictment). Such unindicted co-conspirators are commonly found when the identities or whereabouts of members of a conspiracy are unknown, or when the prosecution is concerned only with a particular individual among the conspirators. This is common when the target of the indictment is an elected official or an organized crime leader, and the co-conspirators are persons of little or no public importance. More famously, President Richard Nixon was named as an unindicted co-conspirator by the Watergate special prosecutor, in an event leading up to his eventual resignation.

Conspiracy against the United States

Conspiracy against the United States, or conspiracy to defraud the United States, [28] is a federal offense in the United States of America under 18 U.S.C.   § 371. The crime is that of two or more persons who conspire to commit an offense against the United States, or to defraud the United States.

Conspiracy against rights

The United States has a federal statute dealing with conspiracies to deprive a citizen of rights secured by the U.S. Constitution. [29]

Unindicted co-conspirators

The United States Attorneys' Manual generally recommends against naming unindicted co-conspirators, although their use is not generally prohibited by law or policy. [30] Some commentators have raised due-process concerns over the use of unindicted co-conspirators. [31] Although there have been few cases on the subject, the Fifth Circuit Court of Appeals addressed these concerns in 1975 United States v. Briggs. [32]

President Richard Nixon

The term unindicted co-conspirator was familiarized in 1974 when then U.S. President Richard Nixon was named as an unindicted co-conspirator in indictments stemming from the Watergate Investigation. Nixon was not indicted, because of concerns about whether the United States Constitution allowed the indictment of a sitting President (see Executive privilege).

President Donald Trump

The term unindicted co-conspirator made a resurgence in the public discourse when U.S. President Donald Trump was allegedly named as an unindicted co-conspirator in the conviction of Trump's lawyer Michael Cohen for lying to congress, tax evasion, uttering fraudulent documents, and campaign finance offenses. Although Trump was not named explicitly, with the term "Un-indicted co-conspirator number 1" used instead, Michael Cohen subsequently testified in congress that "Un-indicted co-conspirator number 1" referred to Donald Trump. [33]


[ relevant? ]

The United Nations special rapporteur Joseph Cannataci wrote a letter to the Japanese Prime-Minister, Shinzō Abe, expressing concerns about Anti-Conspiracy Bill. Hajime Yoshikawa is opposed to the Anti-Conspiracy Bill. [34] Tadashi Shimizu is against the passed Anti-Conspiracy Bill. [35] An opposition party recently accused the prime minister of influencing a government decision to fund and approve a veterinary school at a university owned by Mr Abe's friend. [36] Edward Snowden said "This is the beginning of a new wave of mass surveillance in Japan, not well explained focuses on terrorism and everything else that's not related to terrorism – things like taking plants from the forestry reserve, And the only real understandable answer (to the government's desire to pass the bill) that this is a bill that authorizes the use of surveillance in new ways because now everyone can be a criminal. " And Snowden said it should include strong guarantees of human rights and privacy and ensure that those guarantees are "not enforced through the words of politicians but through the actions of courts." "This means in advance of surveillance, in all cases the government should seek an individualized warrant, and individualized authorization that this surveillance is lawful and appropriate in relationship to the threat that's presented by the police," he said. [37]

International law

Conspiracy law was used at the Nuremberg Trials for members of the Nazi leadership charged with participating in a "conspiracy or common plan" to commit international crimes. This was controversial because conspiracy was not a part of the European civil law tradition. Nonetheless, the crime of conspiracy continued in international criminal justice, and was incorporated into the international criminal laws against genocide.

Of the Big Five, only the French Republic exclusively subscribed to the civil law; the USSR subscribed to the socialist law, the U.S. and the U.K. followed the common law; and the Republic of China did not have a cause of action at this particular proceeding. (In addition, both the civil and the customary law were upheld.) The jurisdiction of the International Military Tribunal was unique and extraordinary at its time, being a court convened under the law of nations and the laws and customs of war. It was the first of its sort in human history, and found several defendants not guilty.

See also


  1. "The Crime of Conspiracy is a Complicated Matter". Archived from the original on 21 August 2016. Retrieved 19 September 2016.
  2. Report on Conspiracy and Criminal Law Reform [1976] EWLC 76 (1 January 1976)
  3. Criminal Law Act 1977 Section 5(2)
  4. Scott v Commissioner of Police of the Metropolis (1974) UKHL 4; [1975] AC 819, 839
  5. Criminal Law Act 1977 Section 5(3)
  6. Shaw v Director of Public Prosecutions [1962] AC 220, [1961] 2 WLR 897, [1961] 2 All ER 446, 125 JP 437, 105 Sol Jo 421, 45 Cr App R 113, HL; Knuller (Publishing, Printing and Promotions) Ltd v Director of Public Prosecutions Archived 24 September 2015 at the Wayback Machine [1973] AC 435, [1972] 3 WLR 143, [1972] 2 All ER 898, 136 JP 728, 116 Sol Jo 545, 56 Cr App R 633, HL
  7. Knuller (Publishing, Printing and Promotions) Ltd v Director of Public Prosecutions Archived 24 September 2015 at the Wayback Machine ; [1973] AC 435, [1972] 3 WLR 143, [1972] 2 All ER 898, 136 JP 728, 116 Sol Jo 545, 56 Cr App R 633, HL (Lords Diplock and Reid dissenting)
  8. Criminal Law Act 1977, section 5(3)
  9. Herring, Jonathan (2008). Criminal Law: Text, Cases and Materials (3rd ed.). Oxford University Press. p.  812. ISBN   978-0-19-923432-5.
  10. R v Rowley, [1991] 4 All ER 649
  11. Hussain R. v (2005) EWCA Crim 87 (07 June 2005) at paragraph 125
  12. R v Hayter [2005] UKHL 6 (3 February 2005) at paragraph 25
  13. 1 2 Conspiracy, 1 Encyclopedia of Crime and Justice 241-2 (2d ed. 2002); James Burke, Sandord Kadish,Dan M. Kahan
  14. Kamara v Director of Public Prosecutions [1974] AC 104, [1973] 3 WLR 198, [1973] 2 All ER 1242, 117 Sol Jo 581, 57 Cr App R 880, HL
  15. "Conspiracy and Sedition as Canadian Political Crimes", v23 1977
  16. "Law on Homosexuals", The Times, The Times Digital Archive (56318), p. 13, 11 May 1965, retrieved 20 July 2012(subscription required)
  17. 1 2 Shaw v. D.P.P. [1962] A.C. 220 (H.L.).
  18. [1972] 2 All E.R. 898 (H.L.) and [1973] 435 A.C. Archived 24 September 2015 at the Wayback Machine
  19. Withers v DPP [1974] 3 WLR 751, HL
  20. The Law Commission. Codification of the Criminal Law: Conspiracies to effect a public mischief and to commit a civil wrong. Working Paper No 63. 1975. para. 4 to 30
  21. Conspiracy Law & Legal Definition, USLegal, Inc.
  22. "Conspiracy" Defined & Explained, The 'Lectric Law Library
  23. "Georgia Conspiracy Lawyer | Conspiracy Defense | Overt Act". Kohn & Yager. Retrieved 9 December 2016.
  24. See United States v. Monroe, 73 F.3d 129 (7th Cir. 1995), aff'd., 124 F.3d 206 (7th Cir. 1997).
  25. 1 2 "California Code, Penal Code – PEN § 182". FindLaw. Retrieved 17 November 2020.
  26. "California Code, Penal Code – PEN § 184". FindLaw. Retrieved 17 November 2020.
  27. § 923, 18 U.S.C. § 371—Conspiracy to Defraud the United States, U.S. Department of Justice's United States Attorneys' Manual .
  28. Title 18, U.S.C., Section 241 – Conspiracy Against Rights Archived 24 December 2007 at the Wayback Machine
  29. "9-11.130 Limitation on Naming Persons as Unindicted Co-Conspirators". United States Attorneys' Manual. Offices of the United States Attorneys. April 2018. Retrieved 26 June 2008.
  30. Robbins, Ira P. (2004). "Guilty Without Charge: Assessing the Due Process Rights of Unindicted Co-Conspirators". Articles in Law Reviews & Other Academic Journals: 1–26. Retrieved 18 May 2018.
  31. "United States v. Briggs, 514 F.2d 794 (5th Cir. 1975)". Casetext. Casetext, Inc. 12 June 1975. Retrieved 18 May 2018.
  33. "4,200 citizens rally to scrap anti-conspiracy bill" . Retrieved 9 December 2017.
  34. "LATEST: Japanese upper house passes controversial anti-conspiracy bill". Archived from the original on 6 August 2017. Retrieved 9 December 2017.
  35. "Japan passes controversial anti-terror conspiracy law". BBC News. 15 June 2017. Retrieved 9 December 2017.
  36. "Whistleblower Snowden warns of looming mass surveillance in Japan". Kyodo News. 2 June 2017. Retrieved 20 January 2018.

Related Research Articles

An indictment is a criminal accusation that a person has committed a crime. In jurisdictions that use the concept of felonies, the most serious criminal offence is a felony; jurisdictions that do not use the felonies concept often use that of an indictable offence, an offence that requires an indictment.

Indecent exposure Public indecency involving nudity of some sort

Indecent exposure is a legal expression to describe the deliberate public exposure by a person of a portion of their body where such exposure is contrary to local standards of appropriate behavior. Social and community attitudes to the exposing of various body parts and laws covering what is referred to as indecent exposure vary significantly in different countries. It ranges from outright prohibition to prohibition of exposure of certain body parts, such as the genital area, buttocks or breasts.

An inchoate offense, preliminary crime, inchoate crime or incomplete crime is a crime of preparing for or seeking to commit another crime. The most common example of an inchoate offense is "attempt". "Inchoate offense" has been defined as the following: "Conduct deemed criminal without actual harm being done, provided that the harm that would have occurred is one the law tries to prevent."

Attempted murder is a crime of attempt in various jurisdictions.

Under the English common law, an accomplice is a person who actively participates in the commission of a crime, even if they take no part in the actual criminal offense. For example, in a bank robbery, the person who points the gun at the teller and demands the money is guilty of armed robbery. Anyone else directly involved in the commission of the crime, such as the lookout or the getaway car driver, is an accomplice, even if in the absence of an underlying offense keeping a lookout or driving a car would not be an offense.

Suicide Act 1961 United Kingdom legislation

The Suicide Act 1961 is an Act of the Parliament of the United Kingdom. It decriminalised the act of suicide in England and Wales so that those who failed in the attempt to kill themselves would no longer be prosecuted.

In criminal law, incitement is the encouragement of another person to commit a crime. Depending on the jurisdiction, some or all types of incitement may be illegal. Where illegal, it is known as an inchoate offense, where harm is intended but may or may not have actually occurred.

An accessory is a person who assists in the commission of a crime, but who does not actually participate in the commission of the crime. Meaning the distinction between an accessory and a principal is a question of fact and degree:

Criminal jurisdiction is a term used in constitutional law and public law to describe the power of courts to hear a case brought by a state accusing a defendant of the commission of a crime. It is relevant in three distinct situations:

  1. to regulate the relationship between states, or between one state and another;
  2. where the nation is a federation, to regulate the relationship between the federal courts and the domestic courts of those states comprising the federation; and
  3. where a state only has, to a greater or lesser extent, a single and unified system of law, it is the law of criminal procedure to regulate what cases each classification of court within the judicial system shall adjudicate upon. People must be tried in the same state the crime is committed.

Murder is an offence under the common law of England and Wales. It is considered the most serious form of homicide, in which one person kills another with the intention to cause either death or serious injury unlawfully. The element of intentionality was originally termed malice aforethought, although it required neither malice nor premeditation. Baker, chapter 14 states that many killings done with a high degree of subjective recklessness were treated as murder from the 12th century right through until the 1974 decision in DPP v Hyam.

Complicity is the participation in a completed criminal act of an accomplice, a partner in the crime who aids or encourages (abets) other perpetrators of that crime, and who shared with them an intent to act to complete the crime. A person is an accomplice of another person in the commission of a crime if they purpose the completion of a crime, and toward that end, if that person solicits or encourages the other person, or aids or attempts to aid in planning or committing the crime, or has legal duty to prevent that crime but fails to properly make an effort to prevent it.

Conspiracy to defraud is an offence under the common law of England and Wales and Northern Ireland.

Criminal law of Singapore Laws of Singapore

Although the legal system of Singapore is a common law system, the criminal law of Singapore is largely statutory in nature. The general principles of criminal law, as well as the elements and penalties of general criminal offences such as assault, criminal intimidation, mischief, grievous hurt, theft, extortion, sex crimes and cheating, are set out in the Penal Code. Other serious offences are created by statutes such as the Arms Offences Act, Kidnapping Act, Misuse of Drugs Act and Vandalism Act.

English criminal law

English criminal law concerns offences, their prevention and the consequences, in England and Wales. Criminal conduct is considered to be a wrong against the whole of a community, rather than just the private individuals affected. The state, in addition to certain international organisations, has responsibility for crime prevention, for bringing the culprits to justice, and for dealing with convicted offenders. The police, the criminal courts and prisons are all publicly funded services, though the main focus of criminal law concerns the role of the courts, how they apply criminal statutes and common law, and why some forms of behaviour are considered criminal. The fundamentals of a crime are a guilty act and a guilty mental state. The traditional view is that moral culpability requires that a defendant should have recognised or intended that they were acting wrongly, although in modern regulation a large number of offences relating to road traffic, environmental damage, financial services and corporations, create strict liability that can be proven simply by the guilty act.

At law, cheating is a specific criminal offence relating to property.

The first signs of the modern distinction between criminal and civil proceedings were during the Norman conquest of England in 1066. The earliest criminal trials had very little, if any, settled law to apply. However, the civil delictual law was highly developed and consistent in its operation.

Conspiracy to murder is a statutory offence defined by the intent to commit murder.

In English criminal law, an inchoate offence is an offence relating to a criminal act which has not, or not yet, been committed. The main inchoate offences are attempting to commit; encouraging or assisting crime; and conspiring to commit. Attempts, governed by the Criminal Attempts Act 1981, are defined as situations where an individual who intends to commit an offence does an act which is "more than merely preparatory" in the offence's commission. Traditionally this definition has caused problems, with no firm rule on what constitutes a "more than merely preparatory" act, but broad judicial statements give some guidance. Incitement, on the other hand, is an offence under the common law, and covers situations where an individual encourages another person to engage in activities which will result in a criminal act taking place, and intends for this act to occur. As a criminal activity, incitement had a particularly broad remit, covering "a suggestion, proposal, request, exhortation, gesture, argument, persuasion, inducement, goading or the arousal of cupidity". Incitement was abolished by the Serious Crime Act 2007, but continues in other offences and as the basis of the new offence of "encouraging or assisting" the commission of a crime.

In law, a conspiracy theory is a theory of a case that presents a conspiracy to be considered by a trier of fact. A basic tenet of “traditional conspiracy theory” is that each co-conspirator is liable for acts of co-conspirators “during the existence of and in furtherance of the conspiracy.” Procedures and proof requirements for conspiracy theory litigation as well as the definition of ‘conspiracy’ vary by jurisdiction and body of law. In civil litigation, it can offer advantages relative to aiding-and-abetting or joint tortfeasor case theories.