/u/commiespaceinvader has previously written Monday Methods posts about Marxism in historical practice and about Antonio Gramsci. You may also be interested in a META discussion of whether AskHistorians itself is Marxist, also feat. /u/alriclofgar and /u/alvisefalier, et al.

EDIT: See also Episode #110 of the AskHistorians Podcast. You can hear it on YouTube if you like.