On a psychological level, perhaps Beria played on Stalin’s mind and helped the thoughts of…
gxorlando
1

Yes. It is easy to see Beria being involved. His job was basically eliminating Stalin’s position and “opposition” to Stalin was anyone who might have suggested that Stalin might not have been 100% right on some minor point. Beria probably put more high-ranking Bolsheviks up against a wall than any leading Nazi could ever dream of.