As opposed to the kind of communism where you ask nicely for revolution? Have you actually read any Marx? I guarantee he was not a pacifist.
You deliberately misquoted me by cutting off the end of that sentence so you could have a nice soft strawman to swing at. The full sentence said
that try to impose communism through the use of force to repress dissent.
Forceful revolution by the workers against the capitalist class is a completely different matter from forceful repression of dissent by the state against students and professors.