This article's factual accuracy is disputed. (June 2011)
The Cambridge Five was a ring of spies, recruited in part by Russian talent spotter Arnold Deutsch in the United Kingdom, who passed information to the Soviet Union during World War II and at least into the early 1950s. Four members of the ring have been identified: Kim Philby (cryptonym: Stanley), Donald Duart Maclean (cryptonym: Homer), Guy Burgess (cryptonym: Hicks) and Anthony Blunt (cryptonym: Johnson); jointly they are known as the Cambridge Four.
Several people have been suspected of being the "fifth man" of the group; John Cairncross (cryptonym: Liszt) was identified as such by Oleg Gordievsky, though many others have also been accused of membership in the Cambridge ring.
The term "Cambridge" in the name Cambridge Five refers to the conversion of the group to communism during their education at Cambridge University in the 1930s. The four known members all attended the university, as did the alleged fifth man, Cairncross. Debate surrounds the exact timing of their recruitment by Soviet intelligence; Anthony Blunt claimed that they were not recruited as agents until they had graduated. Blunt, a Fellow of Trinity College, was several years older than Burgess, Maclean, and Philby; he acted as a talent-spotter and recruiter.
Both Blunt and Burgess were members of the Apostles, an exclusive and prestigious society based at Trinity and King's Colleges. John Cairncross, long suspected of having been the 'Fifth Man', and formally identified as a Soviet agent in 1990, was also an Apostle.
Maclean and Burgess
All four were active during World War II, to various degrees of success. Philby, when he was posted in the British embassy in Washington, D.C. after the war, learned the U.S. and the British were searching for a British Embassy mole (cryptonym Homer) who was passing information to the Soviet Union, relying on material uncovered by VENONA.
Philby learned one of the suspects was Maclean. Realizing he had to act fast, he ordered Burgess, who was on the embassy staff as well and living with Philby, to warn Maclean in England, where he was serving in the Foreign Office headquarters. Burgess was recalled from the United States due to "bad behaviour" and upon reaching London warned Maclean.
In early summer 1951, Burgess and Maclean made international headlines by disappearing. Their whereabouts were unclear for some time. Strong suspicion that they had defected to the Soviet Union turned out to be correct, but was not made public until 1956, when the two appeared at a press conference in Moscow.
It was obvious they had been tipped off and Philby quickly became prime suspect, due to his close relations with Burgess. Though Burgess was not supposed to defect at the same time as Maclean, he went along. It has been claimed that the KGB ordered Burgess to go to Moscow. This move damaged Philby's reputation, with many speculating that had this not been the case, Philby could have climbed even higher in MI6.
Investigation of Philby found several suspicious matters but nothing for which he could be prosecuted. Nevertheless he was forced to resign from MI6. In 1955 he was named in the press, with questions also raised in the House of Commons, as chief suspect for "the Third Man" and he called a press conference to deny the allegation.
Philby was officially cleared by then Foreign Secretary Harold MacMillan; this later turned out to be an error based on incomplete information and bureaucratic inefficiency in the British intelligence organisations.
In the later 1950s, Philby left the secret service and began working as a journalist in the Middle East; The Economist magazine provided his employment there. MI6 then re-employed him at around the same time, to provide reports from that region.
In 1961, defector Anatoliy Golitsyn provided information which pointed to Philby. An MI5 officer and friend of Philby from his earlier MI6 days, John Nicholas Rede Elliott was sent in 1963 to interview him in Beirut and reported that Philby seemed to know he was coming (indicating the presence of yet another mole). Nonetheless, Philby confessed to Elliott.
Shortly afterward, apparently fearing he might be abducted in Lebanon, Philby defected to the Soviet Union under cover of night aboard a Soviet freighter.
MI5 received information from American Michael Straight in 1964 which pointed to Blunt's espionage; the two had known each other at Cambridge some 30 years before and Blunt had tried to recruit Straight as a spy; Straight, who initially agreed, changed his mind afterwards.
Blunt was interrogated by MI5 and confessed in exchange for immunity from prosecution. By 1979 Blunt was publicly accused of being a Soviet agent by investigative journalist Andrew Boyle, in his book Climate of Treason. In November 1979, the Prime Minister Margaret Thatcher admitted to the House of Commons that Blunt had confessed to being a Soviet spy fifteen years previously.
As he was by 1964 without access to classified information, he had secretly been granted immunity by the Attorney General in exchange for revealing everything he knew. He provided a considerable amount of information, and preventing the Soviets from discovering his confession increased the value of his information.
The term "Five" began to be used in 1961, when KGB defector Anatoliy Golitsyn named Maclean and Burgess as part of a "Ring of Five", with Philby a 'probable' third, alongside two other agents whom he did not know.
Of all the information provided by Golitsyn, the only item that was ever independently confirmed was the Soviet affiliation of John Vassall. Vassall was a relatively low ranking spy who some researchers[who?] believe may have been sacrificed to protect a more senior one.
At the time of Golitsyn's defection, Philby had already been accused in the press and was living in a country with no extradition agreement with Britain. Select members of MI5 and MI6 already knew Philby to be a spy from VENONA decryptions. Golitsyn also provided other information that is widely regarded[by whom?] as highly improbable, such as the claim that Harold Wilson (then Prime Minister of the United Kingdom) was a KGB agent.
Golitsyn's reliability remains a controversial subject and as such there is little certainty of the number of agents he assigned to the Cambridge spy ring. To add to the confusion, when Blunt finally confessed, he named several other people[who?] as having been recruited by him.
On the basis of the information provided by Golitsyn, speculation raged for many years as to the identity of the "Fifth Man". The journalistic popularity of this phrase owes something to the unrelated novels The Third Man and The Tenth Man, both written by Graham Greene - who, coincidentally, knew and worked alongside Philby during the Second World War.
It is now widely accepted that the spy ring had more than five members, possibly many more, since three other persons are known to have confessed, several more were nominated in confessions, and circumstantial cases have been made against others. The following were certainly Soviet spies.
- John Cairncross (1913–1995), confessed in 1951; this was publicly revealed in 1990. He was also accused by Anthony Blunt during Blunt's confession in 1964.
- Leo Long (later an intelligence officer), similarly accused by Blunt in 1964.
Ludwig Wittgenstein is alleged to have been a Soviet recruiter at Cambridge by Kimberley Cornish in his 1998 book The Jew of Linz, but his theories about Wittgenstein and the influence of Wittgenstein on Hitler have found little acceptance.
- A Question of Attribution (dramatization of Blunt's term as Keeper of the Queen's Pictures), An Englishman Abroad (dramatization of Burgess in Russia), and The Old Country (about a fictional Philby-esque spy in exile), all by Alan Bennett.
- Another Country (a play loosely based on Guy Burgess' life) by Julian Mitchell, and the subsequent film Another Country.
- A Perfect Spy, by John Le Carré (New York 1986). Events in the life of the character Magnus Pym are partly based upon the life and career of Kim Philby.
- Dennis Potter's television play Traitor (1971) features a central character called Adrian Harris (John Le Mesurier) being interviewed in his Moscow flat by western newspaper reporters, eager to get the story on his defection. Harris appears to be a composite of Philby, Burgess and Maclean. Potter later returned to similar territory with Blade on the Feather (1980), inspired by the unmasking of Anthony Blunt, although in this drama the protagonist Jason Cavendish (Donald Pleasence) is clearly modeled after Philby. Philby is later name-checked as the sports reporter on The Daily Telegraph in Potter's Lipstick on Your Collar (1993), and appears to be giving inside tips on horse-races to officials at the War Office.
- The Untouchable by John Banville. The character Victor Maskell seems to be a combination of Anthony Blunt and poet Louis MacNeice.
- The Jigsaw Man a 1983 film starring Laurence Olivier and Michael Caine. Caine plays a character named Philip Kimberley who returns to England after his defection.
- Cambridge Spies (BBC Drama) with Toby Stephens as Kim Philby, Tom Hollander as Guy Burgess, Rupert Penry-Jones as Donald Maclean, and Samuel West as Anthony Blunt.
- Philby, Burgess and Maclean, 1977 Granada Television drama-documentary, recently re-broadcast on BBC Four, with Derek Jacobi as Burgess.
- Escape, drama-documentary on Philby's defection.
- Blunt: the Fourth Man, television drama, with Anthony Hopkins as Guy Burgess and Ian Richardson as Anthony Blunt.
- High Season (1987 movie) includes a character named "Sharp", fleeing England before being unmasked as a spy.
- In Alan Moore's graphic novel The League of Extraordinary Gentlemen: Black Dossier, there appears a Cambridge Five analogue consisting of the Famous Five from Greyfriars School, including Harry Wharton who would become Big Brother, Bob Kim Cherry (named after Kim Philby) who would be also known as Harry Lime and subsequently M or Mother, Francis Alexander Waverly (possibly formerly known as Frank Nugent) and Sir John Night (possibly formerly known as John Bull).
- The Fourth Protocol, a novel by Frederick Forsyth uses a fictionalised Kim Philby as a central character, who conspires to smuggle a portable nuclear weapon into Britain.
- Burgess, Maclean and Philby appear in the Doctor Who Eighth Doctor Adventures novel Endgame dealing with their defection to Russia.
- The Innocent, a novel by Ian McEwan, involves a spy tunnel which the Soviets discover but do not initially expose, similar to the Philby tunnel
- The Channel 4 education show KNTV features a character called 'Burgess MacPhilbin', who provides information for teenagers in the form of a spy dossier.
- The 2004 film A Different Loyalty, directed by Marek Kanievska, is inspired by Kim Philby's affair and subsequent marriage to Eleanor Brewer, as well as events leading up to his defection to the USSR.
- In 2009, Michael Dobbs wrote a short play, "Turning Point," for a series of live broadcast TV plays on Sky Arts channel. Based on a 1938 meeting between a young Guy Burgess and Winston Churchill, the play sees Burgess urging Churchill to fight the appeasement policy of the British government. In the live broadcast, Burgess was played by Benedict Cumberbatch. 
- Kim Philby appears as one of the central antagonists in William F. Buckley's 2004 novel Last Call for Blackford Oakes.
- The plot of Charles Cumming's 2011 novel, The Trinity Six, is built on the premise that there was a sixth spy and that his existence is being covered up by MI6.
- The Cambridge Five at the Crime Library
- An award-winning essay on the Cambridge Spy Ring at the Education Forum
- Booknotes interview with Anthony Cave Brown on Treason in the Blood: H. St. John Philby, Kim Philby, and the Spy Case of the Century, January 15, 1995.