The National Football League, a multibillion-dollar commercial juggernaut, presides over America's indisputable national pastime. But the NFL is under assault as thousands of former players claim the league has covered up football's connection to long-term brain injuries. In a special two-hour investigation, FRONTLINE and prize-winning journalists Steve Fainaru and Mark Fainaru-Wada of ESPN reveal the hidden story of the NFL and brain injuries, drawn from their forthcoming book League of Denia...
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