LOS ANGELES — Mark Duper, Ottis Anderson and 73 other former players sued the National Football League, claiming it concealed information about the danger of concussions for decades.

The negligence, fraud and liability suit was filed Tuesday in Los Angeles Superior Court. Many players' wives also are plaintiffs.

The suit alleges the NFL knew as early as the 1920s of the harmful effects of concussions but concealed them from coaches, trainers, players and the public until June 2010. It also names helmet-maker Riddell, the NFL's official helmet supplier.