Reinhard Tristan Eugen Heydrich was a high-ranking SS and police official in Nazi Germany as well as one of the principal architects of the Holocaust. He held the rank of SS-Obergruppenführer und General der Polizei. Many historians regard Heydrich as one of the most sinister figures within the Nazi regime. Adolf Hitler described him as "the man with the iron heart."
Beginning in September 1939, Heydrich was chief of the Reich Security Main Office (including the Gestapo, Kripo, and SD). He was also Stellvertretender Reichsprotektor (Deputy Reich-Protector) of Bohemia and Moravia. He served as president of the International Criminal Police Commission (ICPC, now known as Interpol) and chaired the January 1942 Wannsee Conference which formalised plans for the "Final Solution to the Jewish question"—the deportation and genocide of all Jews in German-occupied Europe.
Heydrich was the founding head of the Sicherheitsdienst (Security Service, SD), an intelligence organisation charged with seeking out and neutralising resistance to the Nazi Party via arrests, deportations, and murders.