When did the double agent who was recruited by Arnold Deutsch defect to the Soviet Union ?
Arnold Deutsch Arnold Deutsch (1903–1942?), variously described as Austrian, Czech or Hungarian, was an academic who worked as a Soviet spy, best known for having recruited Kim Philby. Much of his life remains unknown or disputed.
Yuri Krotkov Yuri Vasilevich Krotkov (Юрий Васильевич Кротков, 11 November 1917 - 26 December 1981) was a Russian dramatist. Working as a KGB agent, he defected to the West in 1963.