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Nazi secret state police, 1934, from German Gestapo, contracted from "Geheime Staats-polizei," literally "secret state police," set up by Hermann Göring in Prussia in 1933, extended to all Germany in January 1934.
The secret police of the Third Reich in Germany. The Gestapo operated against Germans suspected of treason by using brutal interrogation and torture; they instilled widespread fear by their terrorist methods.
Note: “Gestapo tactics” in general are intimidating official procedures.
Note: Figuratively, any brutal secret police organization may be called a “gestapo.”