Gang activity and related violence threaten public order in a diverse range of communities in the United States today. Contemporary views of the problem have been formed against the background of a significant adverse secular trend in gang activity during the last four decades. In particular, the rapid growth of gang membership, geographical dispersion, and criminal involvement during the violent crime epidemic -- associated with the emergence of the crack cocaine market during the mid-1980s to the early 1990s -- have intensified current concerns. The experience of those years continues to mark both patterns of gang activity and public policy responses toward them. This book provides background information on the issue of youth gangs, including data on gangs and gang crime. It reviews existing anti-gang initiatives at the federal, state, and local levels, and describes some of the legislation proposed to address the gang problem, as well as some of the issues raised by those bills.