From the Executive Summary: "The 2013 National Gang Report (NGR) highlights current and emergent trends of violent criminal gangs in the United States. Consistent with the 2011 report, the 2013 installment illustrates that gangs continue to commit violent and surreptitious crimes-both on the street and in prison-that pose a significant threat to public safety in most US jurisdictions across the nation. A comprehensive overview of gang activity in the United States, the 2013 NGR examines gangs from a national standpoint and explains how they function as sophisticated criminal networks that engage in all levels of crime in order to further their objectives to gain control of the territories they inhabit and generate revenue. As the 2013 NGR demonstrates, gangs expand their reach through migration into communities across the nation; collaboration with other illicit networks like drug trafficking organizations (DTOs) and rival gangs; active recruitment of membership; and through the absorption of smaller, less visible neighborhood-based gangs (NBGs), which continue to negatively impact US communities at a greater rate than national-level gangs. Intelligence herein also reviews how gangs perpetuate their criminal enterprises through their ability to adapt to changing social and economic environments; exploit new technology; target law enforcement; evade law enforcement detection; and enroll or employ within educational facilities, law enforcement agencies, government bodies, and through all branches of the US military."
Federal Bureau of Investigation: http://www.fbi.gov/