You are right, but many Americans probably wouldn’t get it if you used Stalin. For better or worse, Hitler is the face of fascism; Stalin the face of communism. They were both fascists, as were Mussolini, and Stalin.

It’s just short-hand imagery; everybody knows what you mean. Pinochet was a fascist dictator, but he was also a brutal sociopath, so he’s confusing, even if people recognized him.