| Summary/Abstract |
In the 1940s and early 1950s a Soviet KGB1 mole, Kim Philby, indisputably penetrated the heart of MI6, the Secret Intelligence Service espionage arm of British Intelligence. Furthermore, suspicions continue that the Security Service (MI5), the counterespionage arm of British Intelligence, was also penetrated during the same period. When a group of highly experienced senior members of MI5 came to believe in the 1960s and 1970s that a Soviet mole operated within their own senior ranks, a number of secret investigations were approved within the service. The two principal candidates to emerge as the possible “super” mole were Roger Hollis and Graham Mitchell, who at the time were its Director General and Deputy Director General respectively, but no clear evidence was ever found, or has since been uncovered, of either man’s guilt.
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