Heinrich Himmler
Unlike Hitler, Himmler inspected concentration camps. In August 1941, he saw many Jews being shot in Minsk. It was said that he turned green in the face after brain matter from one of the Jews splashed onto his coat. His assistant had to jump forward and hold him steady. After that, the Nazis searched for a new and easier way to kill. This led to the use of the gas chambers. In June-July 1934 Heinrich Himmler and Reinhard Heydrich were both responsible for the SS to execute Ernst Röhm the head of the SA during Night of the Long Knives .