In "League of Denial: The NFL, Concussions, and the Battle for Truth", Mark Fainaru-Wada, co-author of the best-selling Game of Shadows: Barry Bonds, BALCO, and the Steroids Scandal that Rocked Professional Sports, and his brother Steve Fainaru, a Pulitzer Prize winner for the Washington Post, tell the story of the NFL's extended campaign to suppress efforts to prove the connection between the sport and brain damage.