The document compares and contrasts social theories related to crime causation, and then applies them to explore the causes of gang violence. It discusses three main categories of social theories: social structure theories which assert that crime is caused by poverty and membership in the underprivileged class; social process theories which claim crime is caused by negative interactions with social institutions and relationships; and social control theories which maintain that weak social ties allow criminal behavior. It then analyzes how social learning theory, differential opportunity theory, social reaction theory, and family socialization help explain why youth join gangs and engage in violence.