The conservative estimate of nationwide gang-crime activity, based on law enforcement reports, is 8,625 gangs, 378,807 gang members and 437,066 gang-related crimes for 1993. A more reasonable estimate is 16,643 gangs, 555,181 gang members and 580,331 gang-related crimes for 1993. Among state prison inmates who were gang members, 81 percent reported past drug use and 69 percent said they manufactured, imported or sold drugs as a group. The problem of gangs is reaching a critical point in many communities. Communities are affected as they struggle to pay for law enforcement strategies to combat the operation and spread of gang violence. No one can place a dollar amount on the loss of life and the physical and emotional suffering experienced by victims and neighborhoods under gang siege. The chapter presents a psychological and sociological model of a typical gang member and gang, as well as law enforcement intervention/suppression programs and prevention efforts. It also examines victims’ rights and needs, which have unique aspects when perpetrators are gang members, along with components of a model victim advocacy approach.