(AP) – Thousands of former players are asking a federal judge to reject the NFL’s attempt to dismiss their lawsuits about concussions.

In a brief filed Wednesday in U.S. District Court in Philadelphia, the players dispute the league’s framing of the cases as a labor issue governed by collective bargaining agreements.

Among the players’ arguments: Relevant CBAs did not address long-term brain injuries, the NFL committed fraud by concealing risks of repeated head trauma and the league has a common-law duty to protect players.

The brief says the NFL allowed football to “become the site of perhaps the gravest health crisis in the history of sports.”

The NFL, which filed its motion to dismiss in August, says it did not intentionally mislead players and has tried to better protect their health.

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