Juan Pujol García, also known as Joan Pujol i García, was a Spanish spy who acted as a double agent loyal to Great Britain against Nazi Germany during World War II, when he relocated to Britain to carry out fictitious spying activities for the Germans. He was given the codename Garbo by the British; their German counterparts codenamed him Alaric and referred to his non-existent spy network as "Arabal".
The Security Service, also known as MI5, 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.
John Cairncross was a British civil servant who became an intelligence officer and spy during the Second World War. As a Soviet double agent, he passed to the Soviet Union the raw Tunny decryptions that influenced the Battle of Kursk. He was alleged to be the fifth member of the Cambridge Five. He was also notable as a translator, literary scholar and writer of non-fiction.
Oleg Antonovich Gordievsky, CMG is a former colonel of the KGB who became KGB resident-designate (rezident) and bureau chief in London. He was a double agent, providing information to the British Secret Intelligence Service (MI6) from 1974 to 1985. After being recalled to Moscow under suspicion, he was exfiltrated from the Soviet Union in July 1985 under a plan code-named Operation Pimlico. The Soviet Union subsequently sentenced him to death in absentia.
Nathaniel Mayer Victor Rothschild, 3rd Baron Rothschild was a British scientist, intelligence officer during World War II, and later a senior executive with Royal Dutch Shell and N M Rothschild & Sons, and an advisor to the Edward Heath and Margaret Thatcher governments of the UK. He was a member of the prominent Rothschild family.
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.
Morris Cohen, also known by his alias Peter Kroger, was an American convicted of espionage for the Soviet Union. His wife Lona was also an agent. They became spies because of their communist beliefs.
Michael John Bettaney, also known as Michael Malkin, was a British intelligence officer who worked in the counter-espionage branch of the Security Service often known as MI5.
The Portland spy ring was an espionage group active in the UK between 1953 and 1961. It comprised five people who obtained classified research documents from the Admiralty Underwater Weapons Establishment (AUWE) on the Isle of Portland, Dorset, and passed them to the Soviet Union.
Konon Trofimovich Molody was a Soviet intelligence officer, known in the West as Gordon Arnold Lonsdale. Posing as a Canadian businessman during the Cold War he was a non-official (illegal) KGB intelligence agent and the mastermind of the Portland Spy Ring, which operated in Britain from the late 1950s until 1961.
Since the mid-1970s, a variety of conspiracy theories 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.
Lieutenant Colonel James Harry Allason, was a British Conservative Party politician, sportsman, and former military planner who worked with Lord Mountbatten and Winston Churchill. At the time of his death, he was the oldest living former member of the House of Commons.
Tomás "Tommy" Joseph Harris was a British art dealer and artist, who also served as an MI5 intelligence officer during World War II. As a Spanish-speaker, he worked with Juan Pujol García, a very important double agent in the Double Cross System.
George Donald King McCormick was a British journalist and popular historian, who also wrote under the pseudonym Richard Deacon.
Arnold Deutsch (1903–1942?), variously described as Austrian, Czech or Hungarian, was an academic who worked in London as a Soviet spy, best known for having recruited Kim Philby. Much of his life remains unknown or disputed.
Guy Maynard Liddell, CB, CBE, MC was a British intelligence officer.
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.
Fifth Column was the name MI5, the British Security Service, gave to a World War II operation run from 1942 until at least 1947. It was initially intended to identify people who would be willing to assist Germany in the event of an invasion of the United Kingdom, but as it developed, it also acted to divert its targets away from harmful activities. Although it ended up providing information on more than 500 suspects, it was the source of conflict within MI5, and after the war ended it remained secret, with none of the targets ever aware that they had been its subject. It was revealed in a release of files to the National Archives in 2014.
