"This Fact Sheet highlights findings from the five National Youth Gang Surveys conducted annually since 1996 by the National Youth Gang Center (NYGC). NYGC is funded by the Office of Juvenile Justice and Delinquency Prevention (OJJDP). The nationally representative sample of 3,018 law enforcement agencies includes (1) all police and sheriffs departments serving suburban counties and cities with populations of more than 25,000 and (2) a randomly selected sample of police and sheriffs departments serving rural counties and cities with populations between 2,500 and 25,000. Survey respondents were asked to report information only for youth gangs, defined as 'a group of youths or young adults in your jurisdiction that you or other responsible persons in your agency or community are willing to identify or classify as a gang.' Motorcycle gangs, hate or ideology groups, prison gangs, and adult gangs were excluded from the survey. Annual response rates ranged from 84 to 92 percent during the survey years of 1996 to 2000."
OJJDP Fact Sheet, No.03; FS-200203
National Criminal Justice Reference Service (NCJRS): http://www.ncjrs.gov/