Gang‐involved youth are disproportionately involved in criminal behavior, especially violence. The processes accounting for this enhanced illegal activity, however, remain speculative. Employing a life‐course perspective, we propose that gang membership can be conceptualized as a turning point in the lives of youth and is thus associated with changes in emotions, attitudes, and routine activities, which, in turn, increase illegal activity. Using prospective data from a multisite sample of more than 1,400 youth, the findings suggest that the onset of gang membership is associated with a substantial change in emotions, attitudes, and social controls conducive to delinquency and partially mediate the impact of gang membership on delinquent activity. Desistance from gangs, however, was not associated with similar systematic changes in these constructs, including delinquent involvement.

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The threat of victimization has been regarded as a central feature in both the development and the continuation of youth gangs. Although many studies find the need for protection to be a common reason youth join gangs, recent literature suggests that gang members are at an increased risk of victimization. Given this seeming contradiction between expectations and reality, the current article examines the “objective” and “subjective” dimensions of gang member victimization using panel data collected from youth between the ages of 10 and 16 years. Findings reveal that gang members report higher levels of actual victimization and perceptions of victimization risk than non‐gang‐involved youth. Gang membership is associated with reduced levels of fear, however. Overall, although gangs may not be functional in terms of actual victimization, they seem to decrease anxiety associated with the threat of future victimization.

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Gang members have been found to engage in more delinquent behaviors than comparable nongang youth. Few empirical attempts have been made to identify the group processes associated with the gang experience that lead to such noteworthy behavioral outcomes. While not developed to explain gang behavior, Elijah Anderson's "code of the street" framework may prove insightful. Utilizing data from a diverse school-based sample of 2,216 youth, we examine the efficacy of street code-related variables to explain gang members' heightened involvement in violent offending. Utilizing methods based on a potential outcomes framework, results suggest that joining a gang facilitates greater ascription to street code-related attitudes and emotions, and these constructs partially mediate the relationship between gang joining and the increased frequency of violent offending.