A national spotlight on Colorado’s gang activity is raising concerns that newcomers are bringing new violence. But experts say the Denver metro's gang history is mostly homegrown.

He became involved in the gang in the 1980s in Los Angeles and participated ... He is now the executive director of Homies Unidos and is a violence-prevention worker and expert on gang culture.

The gunmen had just killed two men from a rival gang when ... Cartel in the late 1980s. In May, award-winning journalist Javier Valdez became a high-profile victim of the violence in Sinaloa.