The [American] Founding Fathers never believed that tyranny could arise out of the executive office, because they did not see this office in any different light but as the execution of what the legislation has decreed in various forms. I leave it at that. We know today that the greatest danger of tyranny is, of course, the executive.

Hannah Arendt (1906-1975) German-American philosopher, political theorist

Interview (1973-10) with Roger Errera, Office de Radiodiffusion-Télévision Française (ORTF)

Arendt was referring specifically to the Watergate Scandal and Nixon's abuse of power.

Parts of this interview were turned into an episode of the French TV series "Un certain regard," directed by Jean-Claude Lubtchansky, first broadcast 1974-07-06. (Source (Video))