|a gadget; dingus; thingumbob.|
|an extraordinary or unusual thing, person, or event; an exceptional example or instance.|
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.”