FTP, name the man who replaced Nikolai Yezhov as head of the NKVD, and compiled files on nearly half of the Soviet Union's population during Stalin's Reign of Terror.
After Stalin's death Nikita Khrushechev had him arrested and the ensuing secret trial included no specific charges.  He was gagged at his execution by firing squad to prevent him from compromising Khrushechev and his fellow conspirators.  FTP, name the man who replaced Nikolai Yezhov as head of the NKVD, and compiled files on nearly half of the Soviet Union's population during Stalin's Reign of Terror.
After Stalin's death Nikita Khrushechev had him arrested and the ensuing secret trial included no specific charges.  
Lavrenti Beria