the feud originate before vliet ramos da silva , 21 , a . b . a . " gilson aritana , " a member of the atlas ( " amigos do bairro " ) gang led other members into the " morro de mineira " ( miner hill ) to sell drugs , ricardo sabathia dias , a local police official said . the region is dominated by rival gang comando vermelho ( red command ) , which does not disapproval of other gangs selling cannabis in the areas . comando vermelho eventually was attacking the rival members of ada to safeguard their territory .
Ramos da Silva killed 11 people.