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League of Denial: The NFL's Concussion Crisis

Investigate the health crisis that threatens NFL players and the long-term fortunes of football. Frontline asks the question, "What did the NFL know about the connection between football and traumatic brain injuries — and when did they know it?"

FRONTLINE: League of Denial: The NFL's Concussion Crisis

The NFL is under assault as thousands of former players and a host of scientists claim the league has covered up how football inflicted long-term brain injuries on many players.

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