Answer:
Reinhard Heydrich
Explanation:
Heydrich was involved in the execution of this "Final Solution" from the start. In the summer of 1939, Himmler assigned the job of mass murder to the Einstatzgruppen, killing squads under the control of Heydrich's security police. Most of the commanders came from Heydrich's SD. Heydrich oversaw the massacre of thousands of Jews, Polish leaders, communists and clergymen. He once commented, "We have had to be hard. We have had to shoot thousands of leading Poles to show how hard we can be." In 1941, after the SS established extermination camps in Poland, Heydrich took the job of coordinating the deportation of European Jews to these camps.
