Looks like they're mostly libs, at least according to this study on the topic:
(The above link actually blocked me, so here's another one):
https://not-equal.org/content/pdf/misc/Gross2014.pdf
~80% of history professors identified as Democrats (vs. ~13–14% Republican nationally across all fields).
Self-identified Marxists are rare in academe overall.
The highest concentration was in sociology (~2.6%); in the humanities (where history is), the rate was even lower. While ~25% of humanities/social-science professors consider themselves "radicals or activists," explicitly Marxist identification is a small fraction of that.
Not surprising, sadly. Most universities are shaped to produce graduates who are compliant with the social hierarchy and capitalist system. The administration will tamp down radicalism, very blatantly in their students (see the handling of protests in support of Palestine), but also in the faculty. Marxists like Richard Wolff tend to get edged out. Liberalism reigns. At least in US universities.
@ComradeSharkfucker@lemmy.ml Does that align with your experience?