Some Colonialism/Fascism analysis, because euros talking about eurofascism in the 20s is increasingly irrelevant to the situation at hand in North American settler states.
Zetkin is cool and Dimitrov will always be a boss for being his own defense counsel in front of Hermann Fuckin' Goring, but shit's hella different in this neck of the woods.
Men, Women, and Chainsaws by Carol J. Clover
Not explicitly socialist theory, but some very interesting gender theory focused on analyzing horror movies from the 20th century, namely slasher, possession, and r*pe revenge films. One particularly interesting section discusses how gender is assigned not by the characters' gender, but by their function in the narrative, such as a female killer being "male" coded or a male victim being "female" coded. It's very interesting stuff.