 There are street gangs, with members of similar background and motivations.The term "street gang" is commonly used interchangeably with "youth gang", referring to neighborhood or street-based youth groups that meet "gang" criteria.Miller (1992) defines a street gang as "a self-formed association of peers, united by mutual interests, with identifiable leadership and internal organization, who act collectively or as individuals to achieve specific purposes, including the conduct of illegal activity and control of a particular territory, facility, or enterprise."