The Death's Head emblem similar to Skull and crossbones, often used as the insignia of the Gestapo
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The role of the Gestapo was to investigate and combat "all tendencies dangerous to the State." It had the authority to investigate treason, espionage and sabotage cases, and cases of criminal attacks on the Nazi Party and on Germany.
The law had been changed in such a way that the Gestapo's actions were not subject to judicial review. Nazi jurist Dr. Werner Best stated, "As long as the
... carries out the will of the leadership, it is acting legally." The Gestapo was specifically exempted from responsibility to administrative courts, where citizens normally could sue the state to conform to laws.
The power of the Gestapo most open to misuse was "Schutzhaft" or "protective custody" — a euphemism for the power to imprison people without judicial proceedings, typically in concentration camps. The person imprisoned even had to sign his or her own Schutzhaftbefehl, the document declaring that the person desired to be imprisoned. Normally this signature was forced by beatings and torture.
Heinrich Himmler (left) chief of the SS, with Adolf Hitler (right)
Increasing power under the SS
Laws passed in 1936 effectively gave the Gestapo carte blanche to operate without judicial oversight. A further law passed in the same year declared the Gestapo to be responsible for the set-up and administration of concentration camps. Also in 1936, Reinhard Heydrich became head of the Gestapo and Heinrich Müller chief of operations (although Müller assumed overall command after Heydrich's assassination in 1942). Adolf Eichmann was Müller's direct subordinate and head of department IV, section B4, which dealt with Jews.
During World War II, the Gestapo was expanded to around 45,000 members.
Keeping Hitler in power
By February and March 1942, student protests were calling for an end to the Nazi regime. These protests included non-violent resistance of Hans and Sophie Scholl, two of the leaders of the White Rose student group. Despite the significant popular support for the removal of Hitler, resistance groups and those who were in moral or political opposition to the Nazis were stalled into inaction by the fear of reprisals from the Gestapo. In fact, reprisals did come in response to the protests. Fearful of an internal overthrow, the forces of Himmler and the Gestapo were unleashed on the opposition. The first five months of 1943 witnessed thousands of arrests and executions as the Gestapo exercised a severity hitherto unseen by the German public. Student leaders were executed in late February, and a major opposition organization, the Oster Circle, was destroyed in April 1943.
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http://en.wikipedia.org/wiki/Gestapo