Thereafter, the Chief of Staff of the SA, Ernst Röhm, demanded more political and military power for he and his men, which caused anxiety among military, industrial, and political leaders. In response, Hitler used the SS and Gestapo to purge the entire SA leadership—along with a number of Hitler's political adversaries (such as Gregor Strasser and former chancellor Kurt von Schleicher). It became known as the Night of the Long Knives and took place from 30 June to 2 July 1934. As a reward, the SS became an independent organisation under the command of the "Reichsführer-SS" Heinrich Himmler. He would rise to become Chief of German Police in June 1936 and already had control over the concentration camps system. Upon Hindenburg's death on 2 August 1934, Hitler's cabinet passed a law proclaiming the presidency to be vacant and transferred the role and powers of the head of state to Hitler as Chancellor and Führer (Leader).