Beria was not only a bolshevik mass murderer and torturer of the common kind. According to the memoirs of Khrushchev, Beria was also a serial killer. He would haunt the Moscow streets in his car at night, having his body guard pick up any girl he fancied. Those women would be taken to his house, where he'd drug them, rape them and sometimes kill them. Many times very young girls. The body guards would then be tasked with burying the corpses in his yard. Afterwards the bodyguard gave a list of more than a hundred women who had been raped by Beria.
This man almost became the Soviet leader after Stalin's death, but was outmanoeuvred and later executed. According to Khrushchev, even Stalin feared Beria at times.
From Khrushchev:
"When Rudenko began the interrogation of Beria, a monstrous person was revealed before our eyes, a dreadful beast for whom nothing was sacred."