Do you believe that killing political rivals makes a movement a revolution? Is Assad in Syria running a revolution?
The Nazis went wild with murdering everyone they didn't like after they got elected (not that they weren't into violence before, but Hitler's attempt at a revolution failed in '23, Hitler was convicted and went to prison). They got elected on a populist vote, but that's not a revolution. Revolution != getting elected by normal proceedings.
> ...killing political rivals...
> ...got elected on a populist vote...
To my mind, a violent populist movement is a revolution.
It's not contentious term for me.
20th century Communists, of course, were famously tolerant of their opponents.
Nazi's killed their political opposition, especially Communists.