Totalitarianism was a form of government in which the state recognized no limit to its authority. It was embraced by governing bodies such as the Cardassian Union and the Dominion.
Tom Paris described the Nazis as totalitarian fanatics bend on world conquest, "the Borg of their day". (VOY: "The Killing Game, Part II")
In 1996, a stranded Captain Braxton referred to a policeman as a "quasi-Cardassian totalitarian." (VOY: "Future's End")
Real life totalitarian regimes that were discussed in Star Trek included Nazi Germany and the Soviet Union.