This new HBO documentary revisits the case of the four Newburgh, NY men who were convicted of terrorism – specifically, of plans to bomb synagogues in the Bronx and shoot down military aircraft with missiles. The wrinkle here is, the four were just poor residents of a small town (none of them even owned a car), who were befriended by an FBI informant who promised them money and equipment if they would generate and carry out some terrorist schemes. Enforcement or entrapment? That’s the question – and though the men are behind bars, that question is still being asked.