Yuri Modin (* 1922) was the KGB controller for the "Cambridge Five" from 1944 to 1955, during which period Donald MacLean was said to have passed atomic secrets to the Soviets.
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On 20th October 2012 Brian Sewell suggested that Gow may have been the 'fifth man' and spy master of the Cambridge Five.
While at King's, he was recruited into the Cambridge Apostles, a secret debating society whose members included Guy Burgess, and Michael Straight, who later became spies for the Soviet Union (see Cambridge Five).
He was one of the controllers of the British Soviet spy ring known as the Cambridge Five: Kim Philby, Donald Maclean, Guy Burgess, John Cairncross and Anthony Blunt.