A Manhattan jury convicted 27-year-old Maxwell Hare and 39-year-old John Kinsman on Monday, Manhattan district attorney Cyrus Vance Jr. said in a press release.
Both are members of the Proud Boys, a right-wing extremist organization hated by the Southern Poverty Law Center.
Hare and Kinsman were convicted of attempted first-degree gang attacks. attempted attack in the first, second and third degree; and riots of second degree for their part in a brawl in October 2018 with members of Antifa, a left-wing antifascist group, the prosecutor said.
The fight took place after a group of Proud Boys members left an event at the Metropolitan Republican Club. Antifa members were outside the venue protesting as Hare and Kinsman mocked and threatened them. The anti-fascist demonstrators were removed by the police from the venue, but then intercepted by the Proud Boys group.
Hare and Kinsman were part of a group of Proud Boys members who attacked Antifa members, prosecutors said.
The two men accused the Antifa members of "beat them with hands, fists, feet, elbows, and boots" until the police arrived and fled members of both groups of the release.
The NYPD arrested Hare and Kinsman days later. Both men are to be sentenced on 11 October.
Eight other people were arrested in connection with the fight. Seven of them were sentenced to imprisonment between compulsory civil service and ten months in prison.