Answer
Joseph Stalin introduced Lavrentiy Beria to British and American leaders at the Yalta Conference in 1945 as "My Himmler". This was a reference to the head of the Nazi SS and Gestapo, Heinrich Himmler, who was known for his brutality and ruthlessness. By comparing Beria to Himmler, Stalin was signalling to the Allies that he was prepared to use violence and repression to achieve his goals.