The counterprotesters, who outnumbered the parade crowd, accused the organizers of the event — billed as an opportunity to "embrace the vibrancy" of heterosexuality — of creating an atmosphere of violence toward the LGBTQ community.
Charges against those arrested included disorderly conduct and resisting arrest, though some were charged with assault and battery on a police officer.
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The judge’s decision Tuesday was applauded by Boston’s police union.
“We think these offenders that are here, most of them outside the city of Boston, not residents here, came here as agitators, here for a specific reason, here to create havoc,” Larry Calderone, a spokesperson for the Boston Police Patrolmen's Association, told NBC Boston.
Suffolk County District Attorney Rachael Rollins, whose office sought to drop charges against seven of the protesters, said her office would “use the legal process to remedy the judge's overstepping.”
"By compelling arraignment in every case, the judge punished the exercise of individuals' First Amendment right to protest," Rollins said in a statement.