Councilman Jumaane Williams appeared Thursday with Kirsten John Foy, who's an aide to Public Advocate Bill de Blasio. The New York Civil Liberties Union director also was there.
Williams and Foy were both handcuffed during the incident.
The police Internal Affairs Bureau says complaints about the incident were partially substantiated. Williams says he believes investigators require on-camera proof to discipline officers, and that means most people have no recourse.
The police department didn't immediately respond to a request for comment.