A member of the far-right Proud Boys was arrested on Thursday in connection with a brawl on the Upper East Side that was captured on video, cops said.

Geoffrey Young, 38, was charged with riot and assault for the beatdown of protesters on East 82nd Street on Friday night after Proud Boys founder Gavin McInnes gave a speech at the Metropolitan Republican Club, according to police.

Video from the incident shows members of the Proud Boys pummeling and kicking the protesters while calling them “fa—ts.”

Immediately after the fight, the NYPD arrested three protesters who punched a member of the conservative group and stole a backpack.

After the video surfaced, the NYPD said they plan to arrest nine members of the far-right group.