section: The political left
question: Which law gave Hitler his dictatorial powers?
article: The Holocaust
candidates: German communists, socialists and trade unionists were among the earliest domestic opponents of Nazism and were also among the first to be sent to concentration camps. Hitler claimed that communism was a Jewish ideology which the Nazis termed "Judeo-Bolshevism". Fear of communist agitation was used as justification for the Enabling Act of 1933, the law which gave Hitler his original dictatorial powers. Hermann Göring later testified at the Nuremberg Trials that the Nazis' willingness to repress German communists prompted president Paul von Hindenburg and the German elite to cooperate with the Nazis. MI6 assisted the Gestapo via "the exchange of information about Communism", and, as late as October 1937, the head of the British agency's Berlin station, Frank Foley, described his relationship with Heinrich Müller's so-called communism expert as "cordial". Hitler and the Nazis also hated German leftists because of their resistance to the party's racism. Many leaders of German leftist groups were Jews, and Jews were especially prominent among the leaders of the Spartacist uprising in 1919. Hitler already referred to Marxism and "Bolshevism" as a means of "the international Jew" to undermine "racial purity" and survival of the Nordics or Aryans, as well as to stir up socioeconomic class tension and labor unions against the government or state-owned businesses. Within the concentration camps such as Buchenwald, German communists were privileged in comparison to Jews because of their "racial purity". Whenever the Nazis occupied a new territory, members of communist, socialist, or anarchist groups were normally to be the first persons detained or executed. Evidence of this is found in Hitler's infamous Commissar Order, in which he ordered the summary execution of all political commissars captured among Soviet soldiers, as well as the execution of all Communist Party members in German-held territory. "Einsatzgruppen" carried out these executions in the east. Nacht und Nebel ("Night and Fog") was a directive () of Hitler on 7 December 1941 signed and implemented by Chief of Staff of the Armed Forces Wilhelm Keitel, resulting in kidnapping and the disappearance of many political activists throughout Nazi Germany's occupied territories.