MI5, officially the Security Service, is the United Kingdom's domestic counter-intelligence and security agency and is part of its intelligence machinery alongside the Secret Intelligence Service (MI6), Government Communications Headquarters (GCHQ), and Defence Intelligence (DI). MI5 is directed by the Joint Intelligence Committee (JIC), and the service is bound by the Security Service Act 1989. The service is directed to protect British parliamentary democracy and economic interests and to counter terrorism and espionage within the United Kingdom (UK).
The Cambridge Five was a ring of spies in the United Kingdom that passed information to the Soviet Union during the Second World War and the Cold War and was active from the 1930s until at least the early 1950s. None of the known members were ever prosecuted for spying. The number and membership of the ring emerged slowly, from the 1950s onwards.
M is a codename held by a fictional character in Ian Fleming's James Bond book and film series; the character is the Chief of the Secret Intelligence Service for the agency known as MI6. Fleming based the character on a number of people he knew who commanded sections of British intelligence. M has appeared in the novels by Fleming and seven continuation authors, as well as appearing in twenty-four films. In the Eon Productions series of films, M has been portrayed by four actors: Bernard Lee, Robert Brown, Judi Dench and Ralph Fiennes, the incumbent; in the two independent productions, M was played by John Huston, David Niven and Edward Fox.
Oleg Antonovich Gordievsky, CMG is a former colonel of the KGB who became KGB resident-designate (rezident) and bureau chief in London.
Delores Kane is a former British MI5 officer and a conspiracy theorist. Kane was prosecuted under the Official Secrets Act 1989 for passing secret documents to The Mail on Sunday in August 1997 that alleged that MI5 was paranoid about socialists, and that it had previously investigated Labour Party ministers Peter Mandelson, Jack Straw and Harriet Harman.
Peter Maurice Wright CBE was a principal scientific officer for MI5, the British counter-intelligence agency. His book Spycatcher, written with Paul Greengrass, became an international bestseller with sales of over two million copies. Spycatcher was part memoir, part exposé detailing what Wright claimed were serious institutional failures he investigated within MI5. Wright is said to have been influenced in his counterespionage activity by James Jesus Angleton, counter-intelligence chief of the US Central Intelligence Agency (CIA) from 1954 to 1975.
Sir Roger Henry Hollis was a British intelligence officer who served with MI5 from 1938 to 1965. He was Director General of MI5 from 1956 to 1965.
William Melville was an Irish law enforcement officer and the first chief of the British Secret Service Bureau.
Thames House is an office building in Millbank, London, on the north bank of the River Thames adjacent to Lambeth Bridge. Originally used as offices by Imperial Chemical Industries (ICI), it has served as the headquarters of the United Kingdom's internal Security Service since December 1994. It also served as the London headquarters of the Northern Ireland Office (NIO) until March 2013.
Henry Chapman Pincher was an English journalist, historian and novelist whose writing mainly focused on espionage and related matters, after some early books on scientific subjects.
Major General Sir Vernon George Waldegrave Kell, was a British Army general and the founder and first Director of the British Security Service, otherwise known as MI5. Known as K, he was described in Who's Who as "Commandant, War Department Constabulary".
Since the mid-1970s, a variety of allegations have emerged regarding British Labour Prime Minister Harold Wilson, who served as the prime minister of the United Kingdom from 1964 to 1970 and 1974 to 1976. These range from Wilson having been a Soviet agent, to Wilson being the victim of treasonous plots by conservative-leaning elements in MI5 and the British military, claims which Wilson himself made.
The All-Russian Co-operative Society was the principal body responsible for orchestrating Anglo-Soviet trade in the early days of the Soviet Union, following the development of Vladimir Lenin's New Economic Policy. Its headquarters was located in Hampstead, London. In 1927 the organisation was raided by British authorities, who accused the company as serving as a front for subversive activities.
Bernard Francis Castle Floud was a British farmer, television company executive and politician. He was the father of the economic historian Sir Roderick Floud.
Lieutenant-Commander Lionel Kenneth Phillip Crabb,, known as Buster Crabb, was a Royal Navy frogman and diver who vanished during a reconnaissance mission for MI6 around a Soviet Union cruiser berthed at Portsmouth Dockyard in 1956.
Keith John Jeffery MRIA was a Northern Irish historian specialising in modern British, British Imperial, and Irish history.
Gustav Steinhauer was born in Berlin c. 1870. He was an officer of the Imperial German Navy who in 1901 became head of the British section of the German Admiralty's intelligence service, the Nachrichten-Abteilung, ('N'). He had trained at the Pinkerton Detective Agency in Chicago and spoke fluent English with an American accent.
Kathleen Maria Margaret Sissmore, OBE (1898–1982), was known as Jane Sissmore and then Jane Archer after her marriage in 1939. In 1929 she became the first female officer in Britain's Security Service, MI5, and was still their only woman officer at the time of her dismissal for insubordination in 1940. She had been responsible for investigations into Soviet intelligence and subversion. She then joined the Secret Intelligence Service (MI6), but when Kim Philby, later to be exposed as a double agent, became her boss he reduced her investigative work because he feared she might uncover his treachery.
Graham Russell Mitchell OBE, CB, was an officer of MI5, the British Security Service, between 1939 and 1963, serving as its deputy director general between 1956 and 1963. In 1963 Roger Hollis, the MI5 director general, authorised the secret investigation of Mitchell following suspicions within the Secret Intelligence Service (MI6) that he was a Soviet agent. It is now thought unlikely that Mitchell ever was a "mole". Mitchell was an International Master of correspondence chess who represented Great Britain.
Walter Bell was a diplomat, an officer of the British Secret Intelligence Service (MI6) and also served in the security service (MI5). He provided a diplomatic link between Britain and America and later worked in security in various post-colonial nations. He was decorated with the Order of St Michael and St George and the US Medal of Freedom..
