Lavrenti Beria

Notorious father of the KGB. Beria was appointed by Stalin to head the KGB's predecessor, the NKVD, in 1938, then proceeded to build one of the most ruthless and feared secret services in world history. Under Beria, the KGB engaged in unprecedented levels of secrecy, subversion, political purges, and murder. He also reportedly used his unchallenged power to regularly rape young Soviet girls.

After Stalin's death in 1953, he lost the battle for succession to Malenkov and Khrushchev. The loss proved fatal: he was tried for treason and executed.