Fox News Channel has a brand-new primetime lineup debuting on Monday, as Tucker Carlson Tonight moves to 8:00pm ET and The Five shifts to the 9:00pm timeslot.
Economist Ben Stein said far-left rioters and demonstrators who choose to use violence to crush opposing views display a type of mental illness.
Stein, a former Nixon speechwriter, slammed left-wing demonstrators at places like the University of California-Berkeley as a "fascist" group trying to silence the right.
He said such groups are reminiscent of "ultra-dictatorial" people like Joseph Goebbels, Hitler's propaganda minister.
Stein also noted the case of Yvette Felarca, a schoolteacher who recently advocated for violence in place of discourse when dealing with opposing views.
"This is not about politics, this is about mental illness," he said on "Justice." "I think people who say these things are mentally ill."
Stein said that in a country like America, with such a visible First Amendment right to freedom of speech, advocating or participating in violence to crush opposing views would have to be a sign of illness.
"We have crazy people on the extreme left," he said, noting a piece of art depicting Captain America clutching President Trump's decapitated head.