Early onset Alzheimer’s. Dementia. Lou Gehrig’s disease. The list goes on and on. Now, more than 2,000 former players are suing the National Football League in a major class action lawsuit, saying the league knew but deliberately concealed information about long-term brain damage caused by the concussive injuries sustained so frequently in football. Nation sports editor and writer Dave Zirin appears on Morning Joe to discuss the lawsuit and explain why it makes the NFL so nervous about the future of football.

—Elizabeth Whitman