Lauren Magee and Chris Melde
Street gangs have been the focus of attention for over a century, largely due to their reputation for involvement in illegal activities, especially violence. Indeed, gangs use this reputation for violence as a means of survival, as they seek to intimidate others in order to protect their members from attacks from rival gangs, and to limit the willingness of community members to cooperate with law enforcement officials. Research on the nature of these groups suggests they thrive in marginalized communities, where there are high rates of poverty, family instability, and limited institutional support. Much of the information on street gangs stems from data collected in the United States, but these groups have been documented across the globe in not insignificant numbers. While gangs certainly differ in their structure and organizational capacity, these groups are routinely associated with a disproportionate involvement in delinquent and criminal acts at the local level. Perhaps most concerning, gangs and gang members are known to be associated with substantially higher rates of interpersonal violence, including homicide, than non-gang-involved persons. From a developmental perspective, even brief periods of gang membership have been found to have negative consequences across the early portion of the life course, including reduced educational attainment, lower income, family instability, and a higher likelihood of arrest and incarceration. Overall, the negative effects gangs have on communities appears to outweigh any of the short-term benefits these groups provide their members.
Christian L. Bolden
Gang organization has been an aspect of research that is often explored and debated. The concept of organization is intertwined with questions of whether gangs have leaders, whether gangs can be considered organized crime, which groups are actually street gangs, and other related questions. Though there are some crossover categories, street gangs are viewed as distinctly different than organized crime groups, prison gangs, outlaw motorcycle clubs, skinheads, stoners, and taggers.
Gang structures are widely varied, with a few being highly organized and most being loose networks of associates. The organization of a gang may change over time. There is an array of membership types that range from core members who might maintain affiliation well into adulthood to temporary members who only spend a short time in the gang. Gangs may have sub-group clique structures based on age-graded cohorts, neighborhoods, or criminal activity. Leadership roles in gangs rarely take the form of a recognizable figurehead.
These variations have led to a plethora of gang categories that include evolutionary typologies that place gangs by their stage in criminal sophistication, behavioral typologies that identify gangs by the type of criminal behavior the members engage in, and structural typologies that differentiate gangs by the characteristics of their composition. It is important to note that most of the following gang typologies are focused on gangs in the United States and may not be as relevant in other countries.
Major gang affiliations are also explored. Like other aspects of organizations, affiliations are not stable, as gang alliances are volatile. Despite the ability of affiliations to fluctuate, this categorization strategy is commonly used outside of academic research.