Wikipedia
Copwatch
Copwatch (also Cop Watch) is a network of activist organizations in the United States and Canada (and to a lesser extent Europe) that observe and document police activity while looking for signs of police misconduct and police brutality. They believe that monitoring police activity on the streets is a way to prevent police brutality.
The stated goal of at least one Copwatch group is to engage in monitoring and videotaping police activity in the interest of holding the police accountable in the events involving assaults or police misconduct.
Copwatch was first started in Berkeley, California in 1990.