Foot, a staunch and vocal representative of the postwar British left, was a member of parliament for over 40 years, eventually serving as leader of the House of Commons. He rose to the post of deputy leader of the Labour Party and in 1980 succeeded Jim Callahan as head of the Party. But he stepped down in 1983 in the aftermath of Labour’s largest electoral defeat in over half a century.

Two years later, in 1985, Oleg Gordievsky, a colonel in the Soviet KGB, defected to Britain and disclosed that he had been a double spy for the British from 1974 until his defection. In 1995, Gordievsky chronicled his years as a KGB officer and his espionage for Britain in a memoir, entitled Next Stop Execution. The book was abridged and serialized in the London-based Times newspaper. In it, Gordievsky claimed that Foot had been a Soviet “agent of influence” and was codenamed “Agent BOOT” by the KGB. Foot proceeded to sue The Times for libel, after the paper published a leading article headlined “KGB: Michael Foot was our agent”. The Labour Party politician won the lawsuit and was awarded financial restitution from the paper.

This past week, however, the allegations about Foot’s connections with Soviet intelligence resurfaced with the publication of The Spy and the Traitor, a new book chronicling the life and exploits of Gordievsky. In the book, Times columnist and author Ben Macintyre alleges that Gordievsky’s 1995 allegations about Foot were accurate and that Gordievsky passed them on to British intelligence before openly defecting to Britain. According to Macintyre, Gordievsky briefed Baron Armstrong of Ilminster, a senior civil servant and cabinet secretary to British Prime Minister Margaret Thatcher. Lord Armstrong, a well-connected veteran of British politics, in turn communicated the information to the Secret Intelligence Service (MI6) in the summer of 1982, says Macintyre. The Times columnist alleges that MI6 received specific information from Lord Armstrong, according to which Foot had been in contact with the KGB for years and that he had been paid the equivalent of £37,000 ($49,000) in today’s money for his services. The spy agency eventually determined that Foot may not himself have been conscious that the Soviets were using him as an agent of influence. But MI6 officials viewed Gordievsky’s allegations significant enough to justify a warning given to Queen Elizabeth II, in case the Labour Party won the 1983 general election and Foot became Britain’s prime minister.

The latest allegations prompted a barrage of strong condemnations from current and former officials of the Labour Party. Its current leader, Jeremy Corbyn, who like Foot also comes from the left of the Party, denounced Macintyre for “smearing a dead man, who successfully defended himself [against the same allegations] when he was alive”. Labour’s deputy leader, John McDonnell, criticized The Times for “debasing [the] standards of journalism in this country. They used to be called the gutter press. Now they inhabit the sewers”, he said. Neil Kinnock, who succeeded Foot in the leadership of the Labour Party in 1983, said Macintyre’s allegations were “filthy” and described Foot as a “passionate and continual critic of the Soviet Union”.