Heinrich Himmler

"Heinrich Luitpold Himmler was a German politician who was the 4th Reichsführer of the Schutzstaffel (Protection Squadron; SS), a leading member of the Nazi Party of Germany, and one of the most powerful men in Nazi Germany, primarily known for being a main architect of the Holocaust."¹

"Himmler developed the SS from a 290-man battalion into a million-strong paramilitary group."²

"He was the principal overseer of Nazi Germany's genocidal programs, forming the Einsatzgruppen and administering extermination camps. In this capacity, Himmler directed the killing of some six million Jews, between 200,000 and 500,000 Romani people, and other victims."³

1,2,3: https://en.wikipedia.org/wiki/Heinrich_Himmler