Heinrich Himmler has a strong claim to be Adolf Hitler's most powerful subordinate. He was certainly the main architect of the Holocaust. Appointed Reichsfuhrer-SS in 1929 he built the SS into a million strong paramilitary force and took control of the Nazi concentration camps system. From 1943 he became Chief of German Police and Minister of the Interior with command of the Gestapo as well as the Einsatzgruppen, who committed appalling atrocities and murder in occupied Eastern Europe and Russia.