The Trend inquiry of 1974 cleared Hollis of that accusation, but it was later corroborated by the former KGB officer Oleg Gordievsky.

According to the KGB defector Oleg Gordievsky in 2008, Zakayev was placed # 2 on the FSB assassination list, between Berezovsky and Litvinenko.

The KGB denied any involvement although high-profile KGB defectors Oleg Kalugin and Oleg Gordievsky have since confirmed the KGB's involvement.

Indeed, the identity of the infamous ' fifth man ' in the Cambridge Five remained a mystery outside intelligence circles until 1990, when KGB defector Oleg Gordievsky confirmed Cairncross publicly.

His status was confirmed 10 years later by Oleg Gordievsky, the KGB defector.

Oleg Antonovich Gordievsky (), CMG ( born 10 October 1938 in Moscow, Russian SFSR, Soviet Union ), is a former Colonel of the KGB and KGB Resident-designate ( rezident ) and bureau chief in London, who was a double agent of the British Secret Intelligence Service ( MI6 ) from 1974 to 1985.

During his Danish posting, Gordievsky became disenchanted with his work in the KGB, particularly after the Soviet invasion of Czechoslovakia in 1968 – and made his sentiments known to MI6, who subsequently made contact with him.

The value of MI6's recruitment of such a highly-placed and valuable intelligence asset increased dramatically when, in 1982, Gordievsky was assigned to the Soviet embassy in London as the KGB Resident-designate (" rezident "), responsible for Soviet intelligence gathering and espionage in the UK.

Gordievsky was suddenly ordered back to Moscow on 22 May 1985, taken to a KGB safehouse outside Moscow, drugged and interrogated by Soviet counterintelligence.

Although he almost certainly remained under KGB surveillance, Gordievsky managed to send a covert signal to MI6 about his situation, and they reactivated an elaborate escape plan which had been in place for many years, ready for just such an emergency.

On 19 July 1985, Gordievsky went for his usual jog, but he instead managed to evade his KGB tails and boarded a train to the Finnish border, where he was met by British embassy cars and smuggled across the border into Finland, then flown to England via Norway.

Gordievsky has written a number of books on the subject of the KGB and is a frequently-quoted media pundit on the subject.

In The Daily Telegraph in 2010 Charles Moore gave a " full account ", which he claimed had been provided to him by Gordievsky shortly after Foot's death, of the extent of Foot's alleged KGB involvement.

* Christopher Andrew and Oleg Gordievsky, KGB: The Inside Story ( New York: HarperCollins, 1990 ), 373-74.

In his 7 December 2010 interview, Oleg Gordievsky, ex-KGB intelligence expert, said he was convinced that Zatuliveter's activity had " inflicted more damage the UK security than the entire KGB rezidentura "; according to his information, Zatuliveter had been recruited when a student at St. Petersburg University.

During the early 1980s she was one of only five people who knew that Oleg Gordievsky, the deputy head of the KGB at the Soviet embassy in London, was actually a double agent.

* Oleg Gordievsky ( born 1938 ), KGB agent who defected to the UK

However, the testimony of ex-Soviet KGB agents ( Oleg Gordievsky and Yuri Modin ) has cast doubt on this, as they deny he was the so-called ‘ fifth man ’.

In the 2009 ITV program Inside MI5: The Real Spooks Oleg Gordievsky recounted how he saw the head of the British section of the KGB, expressing surprise at the allegations that he read in a British newspaper about Roger Hollis being a KGB agent saying " Why is it they are speaking about Roger Hollis, such nonsense, can't understand it, it must be some special English trick directed against us " But Chapman Pincher in Treachery states that Hollis was believed to be a GRU agent, the GRU being a different organisation to the KGB.

According to Oleg Gordievsky ( the highest-ranking KGB officer ever to defect ) and Pavel Sudoplatov ( former deputy director of Foreign Intelligence for the USSR ), Pontecorvo was also a Soviet agent.

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.

Indeed, the information passed by Gordievsky became the first proof of how worried the Soviet leadership had become about the possibility of a NATO nuclear first strike.

Soviet authorities subsequently sentenced Gordievsky to death in absentia for treason, a sentence never rescinded by post-Soviet Russian authorities.

Gordievsky congratulated by Baroness Thatcher on his investiture, 18 Oct 2007

In April 2008, the media reported that on 2 November 2007, Gordievsky had been taken by ambulance from his home in Surrey to a local hospital, where he spent 34 hours unconscious.

Gordievsky claimed that he was poisoned with thallium by " rogue elements in Moscow ".

While working at the Russia desk of MI5, he took a large number of secret documents home with him from the office, before trying to turn over some selected highlights to Second Secretary of the Soviet Embassy, KGB officer Oleg Gordievsky, who happened to be an MI6 agent infiltrating the Russians and subsequently turned Bettaney over to British authorities.

In the authorised history of MI5 The Defence Of The Realm, the author Christopher Andrew, using Gordievsky as his source, claimed that Jones passed Labour Party documents to the Soviets for cash, with the last payments to Jones occurring in 1984.

Evidence from defectors like Oleg Gordievsky and files from the Soviet archives show that keeping Kekkonen in power was indeed the main objective of the Soviet Union in its relations with Finland.

Oleg Gordievsky attended the Moscow State Institute of International Relations, and on completion of his studies, joined the foreign service where he was posted to East Berlin in August 1961, just prior to completion of the Berlin Wall.

Gordievsky was questioned for about five hours.

Gordievsky was featured in the PBS documentary Commanding Heights: The Battle for the World Economy.

Gordievsky was appointed Companion of the Most Distinguished Order of St Michael and St George ( CMG ) for " services to the security of the United Kingdom " in the 2007 Queen's Birthday Honours ( in the Diplomatic List ).

Ames gave the Colonel Oleg Gordievsky was the head of the London residency, ( resident ) he spied for the Secret Intelligence Service ( SIS or MI6 ).

Only Oleg Gordievsky was able to escape from USSR with the help of MI6.

According to KGB defector Oleg Gordievsky, Jones provided intelligence to the Soviet Union in return for money.

SIS operations against the USSR continued to gain pace through the remainder of the Cold War, arguably peaking with the recruitment in the 1970s of Oleg Gordievsky whom SIS ran for the better part of a decade, then successfully exfiltrated from the USSR across the Finnish border in 1985.

* Oleg Gordievsky, later defected to the United Kingdom.

Rocky IV has been noted as a prime example of propaganda through film, with both the stark culture contrast of Apollo's patriotic showing in Las Vegas and Drago's cold, subdued performance in the USSR and the ubiquitous yet ineffective KGB officers stationed around Balboa's cabin outside Krasnogourbinsk.

Soon afterwards, however, it was noted that Cuban officials had contacted KGB operatives in Mexico City.

The report of a commission formed at a KGB prison a few days after the October 15, 1956 arrest of Adolfas Ramanauskas (" Vanagas "), chief commander of the Lietuvos Laisvės Kovotojų Sąjūdis or " Union of Lithuanian Freedom Fighters ", noted the following: