| 1. | the German state secret police during the Nazi regime, organized in 1933 and notorious for its brutal methods and operations. |
| 2. | (sometimes lowercase ) of or resembling the Nazi Gestapo, esp. in the brutal suppression of opposition: The new regime is using gestapo tactics. |

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.”