This is a revision of a popular scholarly anthology that examines contemporary gangs in America and law enforcement efforts to study and deal with them. It includes original essays from a broad array of gang researchers and experienced practitioners who work with gangs covering a wide variety of current topics and issues. The contributors: * address definitional and measurement issues * assess behavioural, ecological and socioeconomic dimensions of gangs * discuss important ethnicity and gender factors * present research and community experiences with gangs