No you can’t say Lenin or Luxembourg everyone knows them
well, these are more just people that most people don’t know were marxists. It’s fun to throw these at libs and watch them implode. MLK, Mandela (his close ties to Castro especially), and Einstein.
Oscar Wilde is an especially spicy one for this, as he has this image of an irredeemable upper-class libertine. Also Mark Twain’s passages on the French Revolution and the Philippines Genocide.