The term used to describe a sudden fall of a government, brought about by illegal force is called

The term used to describe a sudden fall of a government, brought about by illegal force is called loup de' etat. A coup d'état, also known by its German name putsch, or simply as a coup, is the overthrow of an existing government by non-democratic means; typically, it is an illegal, unconstitutional seizure of power by a dictator, the military, or a political faction.