Watch Black Mass (2015) HD Full Movie Free on SolarMovie. Watch Black Mass (2015) online free. The true story of Whitey Bulger, the brother of a state senator and the most infamous violent crimin...The true story of Whitey Bulger, the brother of a state senator and the most infamous violent criminal in the history of South Boston, who became an FBI informant to take down a Mafia family invading his turf.