S1, E9: The Vigilante
Chano has to arrest an irate citizen who has been defending the neighborhood from muggers. After several muggings take place in the neighborhood, the police suddenly get assistance from a man who is beating up the muggers. Barney's boss, Lugar, and the District Attorney want to press charges against Mr. Escobar, the vigilante.
Starring Gabriel Dell, Titos Vandis, Marla Gibbs