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There is no single definition of a gang, but there are a number of widely accepted criteria for classifying groups as gangs (Decker and Curry, 2003; Esbensen et al., 2001; Klein, 1995; Miller, 1992; Spergel, 1995). This review used the following criteria: (1) the group has three or more members, generally aged 12-24; (2) members share an identity, typically linked to a name and/or symbols...
