Dartmouth professor Mark Bray was disavowed by the college's president after he called violence committed by the left-wing group Antifa a "legitimate response."

“When pushed, self-defense is a legitimate response to white supremacist and neo-Nazi violence," Bray told NBC earlier this month.

"The way that neo-Nazism grows is by becoming legitimate," said the professor, author of "Antifa: The Anti-Fascist Handbook." 

"The way to stop that is what people did in Boston, what people did in Charlottesville," he said.

Dartmouth President Philip J. Hanlon reprimanded Bray in a statement, saying he was “supporting violent protest.”

“As an institution, we condemn anything but civil discourse in the exchange of ideas,” Hanlon said.

Antifa has become known for its destructive riots and philosophy that violence is the only option against some on the right. The group attacked peaceful protesters at UC Berkeley this week. They smashed property in Washington, D.C., on Inauguration Day and beat white nationalist protesters and a journalist in Charlottesville, Virginia, earlier this month.

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Dartmouth faculty, however, wrote a letter in support their colleague, who they claimed was targeted by "a right-wing organization, Campus Reform, whose goal is to 'smash left wing scum' and which offers bounty prizes to students who will turn in professors names for a campaign of harassment."

Campus Reform states its mission as: "to expose bias and abuse on the nation's college campuses."

Bray says he has received death threats since the controversy.

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