col m ▁Klein ▁and ▁Ch ery l ▁Max son ▁examine ▁the ▁different ▁patterns ▁in ▁characteristics ▁of ▁street ▁gang s ▁( specific ally ▁in ▁America ) ▁and ▁review ▁many ▁major ▁gang - control ▁programs ▁seen ▁around ▁the ▁world . ▁In ▁particular , ▁he ▁focus es ▁on ▁the ▁distribution ▁and ▁expansion ▁of ▁gang s , ▁patterns ▁of ▁gang ▁crime , ▁and ▁how ▁gang s ▁are ▁struct ured ▁and ▁organized . ▁Go ing ▁into ▁a ▁more ▁individual ized ▁level , ▁Klein ▁and ▁Max son ▁analyze ▁risk ▁factors ▁and ▁reasons ▁why ▁people ▁want ▁to ▁join ▁gang s ▁( es pecially ▁in ▁the ▁youth ▁population ) ▁in ▁five ▁different ▁real ms : ▁individual , ▁family , ▁peer , ▁school , ▁and ▁neighborhood . ▁He ▁also ▁brings ▁in ▁community ▁influ ences ▁to ▁further ▁understand ▁how ▁gang ▁develop s ▁and ▁functions ▁inside ▁those ▁communities . ▁Last ly , ▁Klein ▁and ▁Max son ▁provide ▁their ▁ins ights ▁on ▁gang ▁prevent ion ▁and ▁inter vention ▁programs ▁in ▁the ▁United ▁States . ▁They ▁claim ▁that ▁current ▁existing ▁gang ▁control ▁methods ▁are ▁not ▁only ▁in effect ive , ▁but ▁also ▁are ▁confront ing ▁the ▁wrong ▁parts ▁of ▁a ▁gang . ▁To ▁deal ▁with ▁this , ▁they ▁provide ▁a ▁list ▁of ▁gu idel ines ▁and ▁goals ▁that ▁gang ▁prevent ion ▁and ▁inter vention ▁programs ▁are ▁recommended ▁to ▁follow ▁in ▁order ▁to ▁control ▁gang s ▁more ▁successfully . ▁ ▁Gang ▁Cop ▁( 2 0 0 4 ) ▁ ▁Klein ▁describes ▁the ▁experiences ▁of ▁a ▁fict ional ▁police ▁officer ▁who ▁special izes ▁in ▁gang s ▁named ▁Pac