The NFL filed a grievance against the NFL Players Association, asking the union to stop its annual team report cards, saying the exercise violates the Collective Bargaining Agreement by airing public criticism of teams, according to documents obtained by ESPN.

The league claims the report cards, which poll players on various aspects of working conditions, violate a CBA clause that says NFL owners and the union must "use reasonable efforts to curtail public comments by club personnel or players which express criticism of any club, its coach, or its operation and policy," according to an August letter from the league's management council to NFLPA general counsel Tom DePaso, obtained by ESPN.

After months of discussions with the league after the letter, the NFLPA alerted its players to the

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