1. Introduction: Youth violence prevention 2. Patterns of bullying and victimization associated with other problem behaviors among high school students: a conditional latent class approach 3. The mediating effects of delinquent attitudes on race, race heterogeneity, and violent offending 4. Neighborhood-level differences in police discrimination and subcultural violence: a multilevel examination of adopting the code of the street 5. The problem of prediction: the efficacy of multiple marginality in cross-sectional versus prospective models 6. Gay gang- and crime-involved men's experiences with homophobic bullying and harassment in schools 7. Identifying high-risk youth for secondary gang prevention 8. Sex differences and the overlap in youths' risk factors for onset of violence and gang involvement