The head of New York City’s largest police union is calling for the firing of a John Jay College professor after he tweeted “it’s a privilege to teach future dead cops.”

Professor Michael Isaacson, a self-proclaimed member of the Antifa movement who works in the economics department at the CUNY Manhattan college, tweeted from the account @VulgarEconomics: “Some of ya’ll might think it sucks being an anti-fascist teaching at John Jay College but I think it’s a privilege to teach future dead cops” on Aug. 23.

Patrolmen’s Benevolent Association boss Pat Lynch wrote a letter Karol Mason, president of John Jay College of Criminal Justice, demanding the “immediate dismissal” of Isaacson.

Isaacson on Friday said in an email to The New York Post: “I critique policing as an institution which operates at the behest of a state that increasingly represents the weapons and prison industry rather than the public they’re supposed to serve through decades of gerrymandering by both Republicans and Democrats.”

“I illuminate this fact in my classes in the hopes that my students are able to choose a career path that does not put them in the position of having to act as an agent of that institution,” the professor wrote.