Within the Mexican American barrios of Los Angeles, gang activity, including crime and violent acts, has grown and flourished. In the past, community leaders and law enforcement officials have approached the problem, not as something that needs to be understood, but only as something to be gotten rid of. Rejecting that approach, James D. Vigil asserts that only by understanding the complex factors that give birth and persistence to gangs can gang violence be ended.

Drawing on many years of experience in the barrios as a youth worker, high school teacher, and researcher, Vigil...