The Informer (2019)

Pete Koslow, a reformed criminal and former special operations soldier, is working undercover for crooked FBI handlers to infiltrate the Polish mob's drug trade in New York. In a final step toward freedom, Koslow must return to the one place he's fought so hard to leave, Bale Hill Prison, where his mission becomes a race against time when a drug deal goes wrong and threatens to identify him as a mole.