The present research demonstrates that social dominance orientation (SDO) and trust propensity provide a valuable theoretical framework and methodological toolkit with which to both assess the concept of “defiant individualism,” Sánchez-Jankowski’s trait theory of gang membership, and understand social-psychological gang processes. The research samples 95 gang members in London, UK, while looking at the effects of age, contact with the gang, and position in the gang on the presence of SDO and trust propensity. Using path analysis, the research demonstrates gang tenure and rank are strong predictors of high SDO and low trust propensity, independent of time spent in the gang, which also significantly predicts high SDO and low trust propensity. High SDO and low trust propensity in gangs are also positively correlated. Gang members, it seems, exhibit a “defiant individualist” social character and both selection and group socialization processes are accountable. Such, in turn, may help explain intergang relations