Fredrick Douglass? Possibly
Heinrich Himmler implemented Hitler's Holocaust plan to uproot eastern Europeans and send German peasants to colonize their land. They were Nazis and Himmler was responsible for the Holocaust, and directed the mass killing of six million Jewish people, and many other ethnicities. He later committed suicide in the British custody.
The 14th amendment did much to educate and provide jobs for newly freed slaves following the end of the civil war.