A group of Pro Football Hall of Famers led by Eric Dickerson is demanding health insurance coverage and a share of NFL revenues or else those former players will boycott the induction ceremonies.

In a letter sent to NFL Commissioner Roger Goodell, NFLPA Executive Director DeMaurice Smith and Hall of Fame President David Baker — and obtained by The Associated Press — 21 Hall of Fame members cited themselves as “integral to the creation of the modern NFL, which in 2017 generated $14 billion in revenue.”

Among the signees were Dickerson, Jim Brown; Joe Namath; Lawrence Taylor; and Sarah White, the widow of Reggie White.