I can’t stop watching this:
It’s important to remember that the war is against fascism. The Nazis were a particularly (if only briefly) effective group of fascists, but when looking for signs or common features of fascism, just from the 20th century alone it’s important to consider Italy, Spain, Central and South America… and so on.
In 1995, Umberto Eco wrote an essay describing what were, in his view, the fourteen common principles of fascism. His full essay is available online at the New York Review of Books, but this summary should be useful for future reference, to keep watch: