Domination by a government of all political, social, and economic activities in a nation. Totalitarianism is a phenomenon of the twentieth century: earlier forms of despotism and autocracy lacked the technical capacity to control every aspect of life. The term is applied both to fascist governments (see fascism) and to many forms of communism.
The reason I've trotted out the 125 words of these definitions is to show that even the slightest bit of familiarity with fascism and communism should be enough to tell you that the idea that they're opposites is nuts.