▁of ▁gang s ▁is ▁solid ified ▁through ▁opposition ▁from ▁enfor cement ▁and ▁society . ▁Once ▁membership ▁solid ifies , ▁it ▁prompt s ▁others ▁to ▁join ▁and ▁bring ▁the ▁gang ▁group ▁closer . ▁" G ang ▁Struct ures " ▁refers ▁to ▁the ▁organizations ▁of ▁gang s ▁and ▁the ▁knowledge ▁of ▁how ▁each ▁gang ▁functions , ▁what ▁type ▁of ▁gang ▁they ▁fit ▁into , ▁and ▁their ▁characteristics . ▁Finally , ▁" Comm unity ▁Context " ▁refers ▁to ▁the ▁environment ▁where ▁the ▁gang s ▁take ▁place . ▁Klein ▁emphas izes ▁this ▁concept ▁because ▁the ▁community ▁itself ▁describes ▁how ▁gang s ▁behave ▁and ▁their ▁foundation ▁of ▁the ▁gang . ▁Not ▁all ▁these ▁boxes ▁would ▁be ▁filled , ▁but ▁the ▁table ▁can ▁tie ▁together ▁different ▁issues ▁of ▁dealing ▁with ▁street ▁gang s ▁and ▁assess ▁which ▁aspects ▁a ▁policy ▁needs ▁to ▁util ize ▁to ▁make ▁an ▁effective ▁gang ▁control ▁policy ▁and ▁scheme . ▁ ▁Publications ▁ ▁The ▁American ▁Street ▁Gang ▁( 1 9 9 2 ) ▁ ▁In ▁Klein ' s ▁publication ▁of ▁The ▁American ▁Street ▁Gang , ▁he ▁provides ▁us ▁with ▁the ▁basic ▁definition ▁of ▁street ▁gang s , ▁their ▁evolution ▁throughout ▁the ▁past ▁years , ▁their ▁drug ▁invol vement , ▁and ▁reasons ▁to ▁why ▁society ▁has ▁not ▁stopped ▁their ▁actions ▁yet . ▁Klein ▁describes ▁these ▁gang s ▁as ▁an ▁organization ▁of ▁loose ▁bodies ▁tied ▁with ▁multiple ▁and ▁more ▁cas ual ▁leaders hips ▁as ▁compared ▁to ▁our ▁modern ▁day ▁society ▁( with ▁their ▁tight ly - kn it ▁organization ▁and ▁formal ▁leaders hips ). ▁Klein ▁also ▁makes ▁a