Fact-basedstoryabouta1975cover-upofashootingbytwowhitemembersoftheBostonTacticalUnit.Whileonstakeoutonasuspectedgetawaycarusedinaarmedrobbery, thetwogunneddownablackmanwhoenteredthecar.Thetwoclaimedthemanhadagunandtheyshotinself-defense.Policeinvestigationdecideditwasarightfulshooting.Theman"swidowk...