Foucault and Marxism
I don’t care what anyone says: Foucault’s program is clearly deeply Marxist—particularly of the Althusserian brand. Yes, Foucault rejected both Althusser’s use of the word “ideology” and, coordinately, his the realist ontology (although calling Althusser a realist is not quite right). However, every single one of Foucault’s works following Madness and Civilization seems designed to take Althusser’s critique of essentialist subjectivity and demonstrate its truth with historical examples.
Discipline and Punish could be taken as a long riff on the concepts of interpellation or hailing, which Althusser introduces his “Ideology and State Apparatuses” essay—Foucault just converts “state apparatuses” to “school apparatuses” and “prison apparatuses.”