On "On the Nature of Totalitarianism" and On the Origins of Totalitarianism ch. 13 (both from 1953).
Is totalitarianism just an especially virulent form of tyranny, or something unique to the modern age? Arendt says that unlike other forms of government, totalitarianism is not animated by an active psychological principle that motivates its participants. Instead terror is designed to make citizens incapable of agency altogether.