You could benefit from reading this sociologist's account: "Gang Leader for a Day":

<< Sudhir Venkatesh never imagined that as a result of this assignment he would befriend a gang leader named JT and spend the better part of a decade embedded inside the projects under JT’s protection. From a privileged position of unprecedented access, Venkatesh observed JT and the rest of his gang as they operated their crack-selling business, made peace with their neighbors, evaded the law, and rose up or fell within the ranks of the gang’s complex hierarchical structure. >>