Three people protesting a speech by right-wing provocateur Gavin McInnes on the Upper East Side were busted Friday after brawls broke out on neighboring sidewalks, cops said.

The violence started after about 80 protesters gathered outside the Metropolitan Republican Club at Third Avenue and East 83th Street, where McInnes was speaking, police said.

McInnes, a co-founder of Vice Media, heads a right-wing group called the Proud Boys, which has been characterized as a hate group by the Southern Poverty Law Center, and is a since-departed co-founder of Vice Media. The club was vandalized before McInnes’ appearance.

As the audience left at around 8:15 p.m., cops say, three protesters followed a man who broke into a run as he left the building.

The man dropped his backpack, and when he tried to pick it up, a protester punched him and took his property, cops said.

Finbarr Slonim, 20, and Caleb Perkins, 35, both of the Upper East Side, and Kai Russo, 20, from Bushwick, have been freed without bail on charges of felony burglary and misdemeanor assault.

“We vigorously dispute the allegations,” said their lawyer, Moira Meltzer Cohen.

There were no other arrests as of Saturday night, according to police.

Some social media users claim the Proud Boys were the aggressors.

“We followed Proud Boys after Gavin McInnes Republican Club event,” wrote Sandi Bachom, who posted a YouTube video of a sidewalk brawl. “Police escort walked them down Park Ave, then a small group turned down 82nd Street.

Someone tried to take one of their MAGA hats and this happened,” Bachom wrote in reference to the assault.

Photojournalist Shay Horse tweeted about a fight involving “30 (proud boys) V 3 (randoms).”

“It ended with 30 proud boys pummeling a guy on the ground screaming, ‘ARE YOU BRAVE NOW F—-T?!’” he posted.

Vandals had thrown a brick through the window of the same Republican club early Friday, scrawling two anarchy symbols on its front door and gluing the locks, cops said.

The vandalism appeared to also be tied to McInnes’ appearance.

A note found at the club after the vandalism attack read in part, “The Metropolitan Republican Club chose to invite a hipster-fascist clown to dance for them, content to revel in their treachery against humanity.”

But the note also ripped the party in general.

“Tonight, we put the Republican Party on notice, in defiance to the policy of mass misery they have championed,” it read. “The US government has established concentration camps around the country for Latino people, shamelessly murders black people, and continues its war machine that has slaughtered Muslim people with impunity for decades.”

Police Commissioner O’Neil on Saturday said that video recordings of the brawls are being reviewed to determine if more arrests are warranted.

He urged anyone else with information or video to call 1-800-577-TIPS.