Reinhard Tristan Eugen Heydrich (help·info) (7 March 1904 – 4 June 1942) was a high-ranking German Nazi official during World War II, and one of the main architects of the Holocaust. He was SS-Obergruppenführer (General) and General der Polizei, chief of the Reich Main Security Office (including the Gestapo, and Kripo) and Stellvertretender Reichsprotektor (Deputy Reich-Protector) of Bohemia and Moravia. In August 1940 he was appointed and served as President of Interpol (the international law enforcement agency). Heydrich chaired the January 1942 Wannsee Conference, which laid out plans for the final solution to the Jewish Question—the deportation and extermination of all Jews in German-occupied territory.
Historians regard him as the darkest figure within the Nazi elite; Adolf Hitler christened him "the man with the iron heart". He was the founding head of the Sicherheitsdienst (SD), an intelligence organisation tasked with seeking out and neutralising resistance to the Nazi Party via arrests, deportations, and killings. He helped organize Kristallnacht, a series of co-ordinated attacks against Jews throughout Nazi Germany and parts of Austria on 9–10 November 1938. The attacks,