National Gang Threat Assessment 2009
"This intelligence assessment discusses the proliferation of gangs from urban areas to suburban and rural locations, estimates of the number of gangs and gang members in the United States, gang types, gang-related criminal activities, locations where specific gangs operate, and the relationships between gangs and other criminal organizations.

It is a collaborative effort between the National Gang Intelligence center (NGIC) and the National Drug Intelligence Center (NDIC) to examine the threat posed to the United States by criminal gangs. The assessment is based on federal, state, and local law enforcement information and is supplemented by information retrieved from open sources. Information and data used for this report were collected through September 2008."