So were many other left wing politicians/Union Leaders.
If they weren't actual spies i.e. leaking state secrets, they were at the very least "fellow travellors" who did all in their power to bring down Britain ...., Former KGB colonel says he paid late union leader Jack Jones Ł200 for information
snip "The 70-year-old Russian, who lives in Surrey, says he asked Jones to tell him the names of other left-wingers who would make good recruits for the Soviets.
He also claimed Jones also passed on intelligence about the leadership of the Labour Party.
Jones was one of Britain's most prominent left-wing figures, having fought in the Spanish Civil War with the International Brigades before becoming head of the TGWU and a confidant of Harold Wilson and Jim Callaghan, the Labour prime ministers."
And Peter Wright smears Wison directly "Soviet defector Anatoliy Golitsyn is said to have told Alec MacDonald, who set up safe houses where Golitsyn could live, that Wilson was a KGB operative and that former Labour Party leader Hugh Gaitskell had been assassinated by the KGB to have the pro-US Gaitskell replaced as party leader by Wilson.
In his controversial memoir Spycatcher (1987), former MI5 officer Peter Wright stated that the head of the CIA's Counterintelligence Division, James Angleton, told him that Wilson was a Soviet agent when Wilson was elected Prime Minister in 1964. Wright said that Angleton said he had heard this from a source (whom he did not name but who was probably Golitsyn)
At the end of the 1960s, Wright wrote, MI5 received information from two Czechoslovakian defectors, Josef Frolík and František August, who had fled to the West, alleging the Labour Party had "almost certainly" been penetrated by the Soviets. The two named a list of Labour MPs and trade unionists as Soviet agents."