That article has had an introductory statement added to it that includes this; “In light of the recent growth of revolutionary-sounding but anti-proletarian “Marxism,” and the continuing need to break with all post-Marx Marxists and reclaim the full legacy of Marx’s own Marxism.” I wonder why they include Mattick in this list of “post-Marxists”, but not Lenin, Trotsky, or by extension Dunayevskaya?