Noel Haviland Field was an American diplomat who was accused of being a spy for the NKVD. His name was used as a prosecuting rationale during the 1949 Rajk show trial in Hungary, as well as the 1952 Slánský show trial in Czechoslovakia. Much controversy surrounds the Field story. In 2015, the historian David Talbot reignited claims that Field was set up by Allen Dulles in order to create paranoia designed to undermine the Soviet Union.

Hede Tune Massing, née "Hedwig Tune", was an Austrian actress in Vienna and Berlin, communist, and Soviet intelligence operative in Europe and the United States during the 1930s and 1940s. After World War II, she defected from the Soviet underground. She came to prominence by testifying in the second case of Alger Hiss in 1949; later, she published accounts about the underground.