Gangster Squad (2013)

In 1949 Los Angeles, gangster Mickey Cohen tightens his grip on the city, with law enforcement and politicians under his thumb. Determined to bring him down, LAPD Chief Bill Parker forms a covert unit led by Sergeant John O'Mara. With a team of misfit cops, they wage a secret war against Cohen, risking their lives to restore peace to the city. As tensions escalate, alliances are tested, and the line between justice and vengeance blurs.