The National Football League, a multibillion-dollar commercial juggernaut, presides over America's indisputable national pastime. But the NFL is under assault: thousands of former players have claimed the league tried to cover up how football inflicted long-term brain injuries on many players. What did the NFL know, and when did it know it?
Frontline: League of Denial: The NFL’s Concussion Crisis, Part 2, Tuesday at 10 p.m. on PBS 6.
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