Brinsley is believed to be a member of a Baltimore gang, Black Gorilla Family, sources said. The gang has vowed retribution for the deaths of Garner and Brown. Garner died after being put in a chokehold by NYPD Officer Daniel Pantaleo on July 17 on Staten Island. Brown, who was unarmed, was shot dead by Ferguson, Mo. cop Darren Wilson on Aug. 9th. Neither cop was indicted by grand juries, sparking national protests.