Authoritarianism isn't the same thing as fascism.
If you want to take a more Trotskyite view, many post-revolutionary states enter a so called "Bonapartist" phase, where militarism, ultranationalism and symbology combine to produce something which looks a lot like Fascism. Mao and Stalin were not above using ultranationalism and chauvinism to push their rule. North Korea has gone all the way with this with Juche which contains mystical, ultranationalist and even racial supremacist features.