One of the gang members turned state's evidence and testified against the other members.团伙中有一人作为污点证人指证同案犯。One of the gang members turned Queen's evidence and testified against the other members.一名团伙成员供出了对同案犯不利的证据，并做证举报了其他成员。He turned state's evidence in return for a reduced sentence.他供出了同案犯的犯罪证据以求获得减刑。