GestapoThe Geheime Staatspolizei (German for "secret state police"), commonly abbreviated as Gestapo, formed the secret state police force of Nazi Germany.
Recruited from professional police officers, its role and organisation was quickly established by Hermann Göring after Hitler gained power in March 1933. Rudolf Diels was the first head of the organization, initially called Department 1A of the Prussian State Police.
The role of the Gestapo was to investigate and combat "all tendencies dangerous to the State." They had the authority to investigate treason, espionage and sabotage cases, and cases of criminal attacks on the Party and State.
The Gestapo's actions were not restricted by the law or subject to judicial review. The Nazi jurist, Dr. Werner Best, stated, "As long as the [Gestapo]... carries out the will of the leadership, it is acting legally." The Gestapo was specifically exempted from being responsible 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 their own Schutzhaftbefehl (the document declaring the person was to be imprisoned). Normally this signature was forced by torture.
At the Nuremberg Trials the entire organisation was charged with crimes against humanity.