1) Violent crime, especially homicides, are concentrated among small groups and populations in poor minority neighborhoods, even within otherwise safe cities. 2) Traditional approaches to addressing gangs and group violence through enforcement and prevention have shown little effectiveness and cannot accomplish goals like eliminating gangs. 3) A strategic intervention approach focuses on direct and sustained communication with the highest risk street groups through a partnership of law enforcement, social services, and community leaders to convey a unified message that the violence must stop and help is available.