Many professors who have expressed their views about race and politics this year have found themselves targets of both the left and right. Nothing is too abstrusely academic, it seems, to seed an attack campaign fueled by websites that surveil social media to find gotcha-worthy gems. The Professor Watch List, for one, created last year by the conservative group Turning Point USA, is helping drive a new level of scrutiny of professors who, it says, “discriminate against conservative students and advance leftist propaganda in the classroom.” Some sites even send out alerts to subscribers. The latest casualties:

• Sarah E. Bond, professor of classics at the University of Iowa, wrote an academic piece challenging white supremacists’ use of marble antiquities, which had originally been painted colors, to suggest a classical ideal (the white nationalist group Identity Evropa uses Greek figures to promote its brand). After critical columns in Campus Reform and National Review, she was barraged with threats and calls for her dismissal.

• A Texas A & M philosophy professor, Tommy Curry, has received death threats after a column in The American Conservative drew on a 2012 podcast in which Dr. Curry made an academic argument about violence against blacks by whites versus violence against whites by blacks. The column was headlined “When Is It O.K. to Kill Whites?”

• Trinity College in Hartford put Johnny Eric Williams on leave after he shared a provocative post from the website Medium arguing that bigots in peril should be left to die and referencing another post calling Steve Scalise, the Republican representative shot during baseball practice, a bigot. He then posted his own Facebook messages with a hashtag based on the post’s anti-white headline: “Let Them [expletive] Die.” The threats were so virulent the campus closed for a day, and Dr. Williams and his family fled the state.