Rosa Luxemburg was a Marxist. In the same text that the authors of “No War but the Class War” quote, she proclaims blithely that “Imperialist world domination is an historical necessity” and therefore that “imperialism ultimately works for us” [i.e., the proletariat]. https://anarchistnews.org/content/spirit-sholem-schwarzbard-addressing-confu... " . . . if you ask anarchists from Donbas and Crimea, they will tell you very clearly why so many people in Ukraine are risking their lives to fight the Russian army. We might as well have urged the residents of Kobanî to reject militarism back in 2014 when the Islamic State was besieging their city. Sometimes you do not have the choice to opt out of war.