Suspended John Jay College of Criminal Justice professor Michael Isaacson’s tweet about teaching “future dead cops” was no isolated incident.

The school put Isaacson — an adjunct economics professor, antifa leader and self-professed anarchist — on paid leave after his two-week-old tweet declaring it “a privilege to teach future dead cops” was reported.

John Jay’s student body is made up largely of those planning law enforcement careers, including police work.

But while school president Karol Mason condemned the “abhorrent” tweet (though never mentioning Isaacson’s name), she stressed that she was suspending him only to protect students and faculty who had “received threats.”

And since then, searches of Isaacson’s Twitter feed have uncovered more anti-police tweets dating back nearly two years. Like this, from Dec. 5, 2015: “The solution to American gun violence is more dead cops.” Or this, just a week before the tweet that got him suspended: “What’s even the point of a cop that isn’t dead?”

He has also expressed support for convicted cop killer Asata Shakur, who is living in Cuba after escaping American justice, the New York Post reports.