The preliminary hearing in a lawsuit brought by former players against the NFL alleging misinformation over head injuries has ended for Tuesday in Philadelphia.

Both sides presented their arguments, according to The Associated Press, with the players side saying the league profited from “glorified violence.”

Players’ lawyer David Frederick also accused the league of concealing the emerging science about concussions over several decades, even after creating a Mild Traumatic Brain Injury committee in 1994.

“It set up a sham committee designed to get information about neurological risks, but in fact spread misinformation,” Frederick argued at a pivotal federal hearing to determine if the complaints will remain in court or be sent to arbitration.

U.S. District Judge Anita Brody’s decision could be worth billions to either side.

More than 4,000 former players — who claim to be suffering from ailments ranging from dementia, depression, Alzheimer’s disease and other neurological problems to no symptoms at all — have joined the suit. A single lawsuit has been joined from hundreds of smaller lawsuits.

The players’ lawyers want to keep the litigation in federal court so they can use the discovery process to access NFL files to see what the league knew, and when it knew it. The NFL argues that the issue belongs in arbitration under terms of the collective bargaining agreement.