Gangs are a serious problem / Edward Cohn -- Gangs affect every part of a community / James C. Howell -- Gangs create community for members / John Seita -- Gangs are an urban problem / Howard N. Snyder and Melissa Sickmund -- Gangs are a suburban and rural problem / Glenn Smith -- Hip-hop culture promotes gangs / Chip Johnson -- Hip-hop culture does not promote gangs / Harold M. Clemens -- The number of girls in gangs is increasing / Mars Eghigian and Katherine Kirby -- The number of immigrants in gangs is increasing / Domash Shelly Feuer -- Gang intervention programs are successful / Victor M. Gonzalez, Jr. -- Gang intervention programs are not successful / Hector Gonzalez -- Community-based gang intervention is effective / Phelan Wyrick -- Mentoring is the most effective gang intervention / Thomas J. Smith -- Positive family values are the most effective gang intervention / Heather MacDonald.