The word “communism” is capitalized regardless if it is used as a proper or
Do you capitalize socialism and communism?
Communism, capitalism, socialism, and solidarity need caps in headings and articles? Your three "isms" are common nouns and should not be capitalized (except of course when they're the first word of a sentence/title/heading/etc).
Is communist capitalized in AP style?
Capitalize Communist, Conservative, Democratic, Liberal, Republican, Socialist, etc., when they refer to a specific party or its members. Lowercase the name of a philosophy in noun and adjective forms unless it is the derivative of a proper name: communism, communist; fascism, fascist. ...