Peter Deriabin

Peter Sergeyevich Deriabin (Russian: Петр Сергеевич Дерябин; 1921 – 20 August 1992) was a KGB officer who defected to the United States in 1954.

He was later an investigator with the People's Commissariat of Internal Affairs (NKVD), where he eventually moved up to the organization's headquarters and gained the rank of Colonel.

[7] In 1953 following Stalin's death, Deriabin was stationed in Vienna as Chief of Soviet Counterintelligence as well as Communist Party boss for the entire Austro-German section.

Among them was removing the West's preeminent cold warrior from the scene, constraining US covert actions against Cuba, which would be stigmatized as acts of vengeance, as well as diverting the Soviet people's attention from their many domestic problems.

He was also involved in the Yuri Nosenko case as an interrogator and as the editor of the secret recordings made of Nosenko's meetings with Tennent H. Bagley and George Kisevalter (in which he found 150 errors made by the native-Russian-speaking Kisevalter; see pages 580-81 in Bagley's 1978 HSCA testimony as "Mr. D.C." -- as in "Deputy Chief" in HSCA Report, Volume XII at maryferrell.org).

[11] Nosenko was a controversial Soviet defector who was interrogated harshly (but not torturously) by the CIA, detained under Spartan living conditions (including solitary confinement), and presumed to be a KGB plant by Bagley, James Angleton, and the Chief of the Soviet Russia Division, David E. Murphy, from 1964 until he was "cleared" in late 1968 by possible KGB "mole" Bruce Solie, and released.