Anti-fascist protesters had gathered outside the building, prompting police to escort some of those inside the club in the opposite direction following the event.
Proud Boys describes itself as a "pro-Western fraternal organization".
ThinkProgress also reports that the white nationalist group "took to the streets, brutally beating and kicking several individuals while shouting "faggot" and 'cocksucker, ' reportedly because one of them stole one of their MAGA hats". "It's approximately 38 seconds between when six dressed in black with masks throw bottle to the uniformed officers arrive on scene with the scooters".
The Proud Boys even waited to do a group photo after the fights.
So far the NYPD has made three arrests connected to the brawl that erupted a few blocks from the Metropolitan Republican Club. No serious injuries were reported, however, and police said the victims refused medical attention.
"We followed Proud Boys after Gavin McInnes Republican Club event", writes onlooker Sandi Bachom, a journalist, who posted a YouTube video of the brawl. A note left at the scene claimed that the damage was "just the beginning". The Southern Poverty Law Center has designated the Proud Boys a hate group.
This weekend saw physical altercations between protest groups in two major American cities, both Portland, Oregon and New York City.
McInnes, who co-founded Vice Media in 2008 and left the company in 2008, created the Proud Boys in 2016.
McInnes' lecture at the Metropolitan Republican Club was reportedly about Japanese right-wing extremist Otoya Yamaguchi, who assassinated Japan Socialist Party leader Inejiro Asanuma with a sword in 1960. Elected officials were outraged over the online videos showing the violence, saying they showed Proud Boys members were involved and should face consequences.