Karl Marx was actually a lot of things, and not all of them bad.

Libertarians and Anarchists coming from the Right tend to call all Authoritarian, Statist policies "Communist".

Libertarians and Anarchists coming from the Left tend to call all Authoritarian, Statist policies "Fascist".

If you're orange-pilling a Conservative, sure, go ahead and say "Communism!". If its a Liberal, say "Fascism!".

But among people who already agree on freedom, those terms cast more heat than light