When did the double agent who was recruited by Arnold Deutsch defect to the Soviet Union ?
Kim Philby Harold Adrian Russell "Kim" Philby (1 January 1912 – 11 May 1988) was a high-ranking member of British intelligence who worked as a double agent before defecting to the Soviet Union in 1963. He served as both an NKVD and KGB operative.
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.