A college professor was injured by a 'seriously scary' and violent student mob as she escorted a conservative guest speaker off campus.

Professor Allison Stanger at Middlebury College in Vermont suffered a neck injury after her hair was yanked by unruly demonstrators while she was escorting author Charles Murray off campus on Thursday.

The screaming crowd, made up of students and 'outside agitators', were protesting Murray's visit and attempted to stop his car by climbing on the vehicle, hitting its windows and throwing a stop sign at it, a college official said.

Murray, who has been called a white nationalist, had to have his lecture moved to a private room because of the commotion, and later said in a tweet the students, some of which who were wearing masks, were 'seriously scary'.

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Professor Allison Stanger (left) suffered a neck injury after a protester yanked her hair as she was escorting speaker Charles Murray (right) off the Middlebury College campus on Thursday

The violent mob of students and 'outside agitators' were protesting Murray's visit to the Vermont college's campus. After the protesters disrupted Murray's lecture, Stanger and Murray were moved to a private room to record the talk

After the incident Murray tweeted that the students 'were seriously scary'

The conservative is the author of the controversial book The Bell Curve, which makes an argument that blacks are intellectually inferior to whites because of genetics, reported the New York Times.

Hundreds of demonstrators turned up to Murray's lecture and protested for 25 minutes. They were so disruptive, he was moved to another room to have his talk recorded.

Middlebury College students turned their backs on Murray just as he started to speak and chanted 'Who is the enemy? White supremacy!', 'Racist, sexist, anti-gay, Charles Murray, go away!' and 'Your message is hatred. We cannot tolerate it.'

A Middlebury communications official called the protesters a 'mob', reported Seven Days.

He said: 'The demonstrators were trying to block Mr. Murray and Professor Stanger's way out of the building and to the car.

The protesters inside the student center turned their backs on Murray and chanted. Later a spokesperson for the college said a screaming crowd threw a stop sign at Murray's vehicle as it was leaving. It's unknown if the students pictured inside were part of the protesters outside

Video courtesy of Will DiGravio

'It became a pushing and shoving match, with the officers trying to protect those two people from demonstrators — and it became violent. This was an incredibly violent confrontation.'

College president Laurie L. Patton said she was 'deeply disappointed' by the events she witnessed and said members of the college community had 'failed to live up to our core values.'

The college added: 'We do respect the right of people to protest, to make their views heard, but ultimately not to disrupt an event to the point where it can no longer continue as designed.'

This is not the first time Murray has been protested and criticized by a college campus.

Murray (right) has been called a white nationalist and protesters chanted 'Who is the enemy? White supremacy' among other things for 25 minutes

College president Laurie L. Patton said she was 'deeply disappointed' by the events and said members of the college community had 'failed to live up to our core values'

Murray began his lecture at the college's student center (pictured). More than a hundred people turned up to protest his talk

Before a visit to Virginia Tech, the president of university issued a statement in March of 2016 that said: 'Dr. Murray is well known for his controversial and largely discredited work linking measures of intelligence to heredity, and specifically to race and ethnicity— a flawed socioeconomic theory that has been used by some to justify fascism, racism and eugenics.'

Middlebury student and protest organizer Elizabeth Dunn said: 'Both students and other community members came out to show that we are not accepting these kind of racist, misogynistic, eugenist opinions being expressed at our college.

'We don't think that they deserve a platform because they are literally hate speech.'

The student group American Enterprise Institute Club invited Murray, believing it's important to bring speakers from all intellectual and ideological backgrounds to campus, said Alexander Khan, its vice president.

'Our goal really was to get a conversation started, whether you believe in what Dr. Murray has to say or whether you vehemently disagree with him,' he said.