"Strategies to Address Gang Crime: A Guidebook for Local Law Enforcement provides information about developing and enhancing local law enforcement responses to gangs in their jurisdictions. The focus of the guidebook is on the use of problem-solving strategies to help agencies select the interventions most appropriate for their jurisdictions. In particular, the guidebook describes the SARA model (Scanning, Analysis, Response and Assessment), a strategic problem-solving process that local law enforcement can apply to its local gang problem. Growing evidence (Dalton, 2004) shows that applying the SARA model will greatly improve the law enforcement response to gangs and will lead to safer communities. National surveys of law enforcement agencies provide the most widely accepted assessment of the magnitude of the United States gang problem. Unfortunately, not many such surveys existed prior to 1970. The two states with the largest gang population in 1970 (California and Illinois) retained their position in 1998, and were joined by Texas, Florida, and Ohio. This finding of dispersion of gang problems among the states is an important theme in characterizing the changes in gangs over time. Such changes were reflected in the region of gang location, because gangs were located primarily in the West in the early 1970s, with very few gangs in the South. By 1998, the South ranked second among the four regions, and had recorded a 33 percent increase in the number of gangs. A concomitant change occurred in the presence of gangs by city size."
United States Department of Justice: http://www.usdoj.gov/