McInnes was invited to speak by the NYU College Republicans.
Several disruptive students were arrested by police after McInnes was reportedly pepper-sprayed by a critic.
Live video from inside the event showed McInnes speaking to the crowd and shouting at protesters who managed to sneak into the seminar.
Almost a dozen people were arrested Thursday night during a protest at NYU over a scheduled appearance of conservative actor and media entrepreneur Gavin McInnes.
Police arrested eight men and three women on charges including criminal mischief, drug possession, disorderly conduct and obstructing government administration, cops said.
McInnes' speech was stopped when protesters rushed the room.
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"Come to Kimmel, Rosenthal Pavilion to let NYU know that we will not stand for bigotry, racism, homophobia, transphobia, misogyny on our campus", the group wrote in a Facebook post.
Most recently, in December 2016, Gavin McInnes launched an informal group called the Proud Boys, an "anti racial guilt", anti-feminist organization. "Then I saw this guy, Franklin Right, wearing a red lumber jack shirt, he started a whole chant of "Heil Hitler" with the Nazi salute".
NYU spokesman John Beckman said that while there was reaction against McInnes inside Kimmel - where only people with NYU ID cards could get in - there was no violence or arrests.
Protests erupted Wednesday night at UC Berkeley in California ahead of a planned appearance by right-wing commentator Milo Yiannopoulos.
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