also: マルキスト
noun
Marxist
Refers to a follower of Marxism or something related to Marxist ideology.
彼は熱心なマルキシストだ。
He is a devoted Marxist.
Shorter variant, less common but still used.
マルクス主義 is 'Marxism' (the ideology), while マルキシスト is 'Marxist' (a person or adjective).
Borrowed from English 'Marxist', ultimately from the name Karl Marx.