This encyclopedia includes extended discussion of specific gangs; types of gangs based on ethnicity and environment (rural, suburban, and urban); recruitment and retention methods; leadership structure and other internal dynamics of various gangs; impacts of gang membership on extended family; the historical evolution of gangs in American society; depictions of gang life in popular culture; violent and nonviolent gang activities; and programs, policies, agencies, and organizations that have been crafted to combat gang activities. In addition, the encyclopedia includes a suite of primary sources that offer a look into the personal experiences of gang members, examine efforts by law enforcement and public officials to address gang activity, and address wider societal factors that make eradicating gangs such a difficult task.