Original: Lavrentiy Pavlovich Beria ( or Beriya ; ; ; 29 March 1899 â '' 23 December 1953 ) was a Georgian Soviet politician , and chief of the Soviet security and secret police apparatus ( NKVD ) under Joseph Stalin .
Simplified: Lavrentiy Pavlovich Beria ( also spelled Lavrenty Beria ) ( 29 March 1899 - 23 December 1953 ) was the leader of the secret police of the Soviet Union under Joseph Stalin 's regime .