According to an upcoming book by ESPN reporters Mark Fainaru-Wada and Steve Fainaru, the NFL "conducted a two-decade campaign to deny a growing body of scientific research that showed a link between playing football and brain damage".
Excerpts published Wednesday by ESPN The Magazine and Sports Illustrated from the book, "League of Denial: The NFL, Concussions and the Battle for Truth," report that the NFL used its power and resources to discredit independent scientists and their work; that the league cited research data that minimized the dangers of concussions while emphasizing the league's own flawed research; and that league executives employed an aggressive public relations strategy designed to keep the public unaware of what league executives really knew about the effects of playing the game.
Excerpts of the book are available from ESPN The Magazine and Sports Illustrated. An episode of Frontline based in part on the book airs next week. Interestingly, ESPN was collaborating with Frontline on this program, but they pulled out of it in August.