May 14, 2020
The first NKGB agent to penetrate Los Alamos was the German-born British physicist Klaus Fuchs, who had been recruited by the GRU in 1941. Fuchs was a committed, doctrinaire Communist, who during the Terror had been an enthusiastic participant in dramatized readings of the transcripts of the show trials organized by the British Society for Cultural Relations with the Soviet Union. He impressed his research supervisor, the future Nobel Laureate Sir Nevill Mott, with the passion with which he played the part of the prosecutor, Andrei Vyshinsky, 'accusing the defendants with a cold venom that I would never have suspected from so quiet and retiring a young man'.
Christopher Andrew, The Secret World