Reichstag fire

The decree nullified many of the key civil liberties of German citizens. With Nazis in powerful positions in the German government, the decree was used as the legal basis for the imprisonment of anyone considered to be opponents of the Nazis, and to suppress publications not considered "friendly" to the Nazi cause. The decree is considered by historians as one of the key steps in the establishment of a one-party Nazi state in Germany.

https://en.wikipedia.org/wiki/Reichstag_fire

https://en.wikipedia.org/wiki/Reichstag_Fire_Decree