@andytiedye @sfehl @GryphonSK
Hell no, not Trotsky! Anton Pannekoek, Daniel GuƩrin, Paul Mattick, Cornelius Castoriadis, Murray Bookchin, Sam Dolgoff, and Maurice Brinton are some notable Libertarian Marxist authors to look into to learn about Marxism. Rosa Luxemburg, while not a Libertarian Marxist, is also a very good author who wrote on Marxism and critiqued the authoritarianism and bureaucracy within the socialist movement of her time.