anthro, sociology, language arts (like, "Anglo-Saxon" studies literally renamed itself "Old English" because Da Racists used the older term) professors have a stereotypical tendency to wave the red banner

partly it's because they figure "I'm teaching the very nuts and bolts of society itself" or the machinery of language that everyone must use to describe the world around them: there's as many lefties in the other humanities departments, but their disciplines require something more than generalities; plus Sayre's Law, "Academic politics is the most vicious and bitter form of politics, because the stakes are so low"

(it goes the other way around: Neil deGrasse Tyson's notorious for thinking his degree in galactic spectroscopy entitles him to talk over everyone else about the Byzantine Empire, the 1258 fall of Baghdad, or Baroque Italy--in fact, that he has MORE authority than a mere historian, why, their job's just checking some books out of the library, right?)