o ▁Dom ingo ▁based ▁on ▁his ▁own ▁observations ▁and ▁research ▁throughout ▁his ▁time ▁in ▁gang ▁activity ▁research . ▁By ▁using ▁Pac o ▁Dom ingo ▁as ▁a ▁character , ▁the ▁author ▁explains ▁the ▁inner ▁structures ▁and ▁organization ▁of ▁gang s ▁and ▁the ▁dangerous ▁effects ▁of ▁when ▁police ▁officers ▁use ▁violent ▁and ▁cor rupt ▁measures ▁to ▁deal ▁with ▁gang s . ▁Additionally , ▁Klein ▁tal ks ▁about ▁one ▁of ▁the ▁most ▁important ▁part ▁of ▁the ▁journey ▁of ▁a ▁gang ▁cop , ▁their ▁training . ▁Over all , ▁this ▁book ▁highlight s ▁the ▁main ▁points ▁that ▁are ▁useful ▁for ▁those ▁interested ▁in ▁the ▁spread ▁of ▁gang s ▁in ▁America , ▁such ▁as ▁cr imin olog ists , ▁law y ers , ▁law ▁enfor cement , ▁police ▁officers , ▁and ▁much ▁more . ▁ ▁Other ▁publications ▁ ▁Ch asing ▁After ▁Street ▁G angs ▁( 1 9 7 1 ) ▁The ▁Street ▁G angs ▁of ▁Euro burg : ▁A ▁Story ▁of ▁Research ▁( 2 0 0 9 ) ▁ ▁Activ ities ▁ ▁Euro gang ▁Project ▁( 1 9 9 8 ) ▁ ▁The ▁European ▁Research ▁Group , ▁led ▁by ▁Klein ▁himself , ▁was ▁a ▁conference ▁that ▁took ▁place ▁in ▁Sch mit ten , ▁Germany ▁in ▁ 1 9 9 8 .( 2 ) ▁During ▁this ▁three - day ▁time ▁period , ▁he ▁attempted ▁to ▁produce ▁compar ative ▁gang ▁cr imin ology ▁into ▁a ▁global ▁context ▁by ▁starting ▁with ▁Europe . ▁Klein ▁brought ▁many ▁different ▁questions ▁to ▁hand , ▁such ▁as ▁whether ▁or ▁not ▁gang s ▁exist ▁in ▁Europe