“Various community groups have criticized police brutality. These groups often stress the need for oversight by independent citizen review boards and other methods of ensuring accountability for police action.
Copwatch is a U.S.-based network of organizations that actively monitors and videotapes the police to prevent police brutality. Umbrella organizations and justice committees (often named after a deceased individual or those victimized by police violence) usually engage in a solidarity of those affected. Amnesty International is another organization active in the issue of police brutality.
Tools used by these groups include video recordings, which are sometimes broadcast using websites such as YouTube” (http://en.wikipedia.org/wiki/Police_brutality#cite_note-Amnesty_2007-0).
Law Enforcement: Police Misconduct in the United States 