The MLB Players' Association has filed a grievance on behalf of players who have a provision in their contracts under which they agree to make a donation through his club to a charitable organization, MLBPA chief operating officer Gene Orza told ESPN's Karl Ravech.
Outside of Willy Aybar, I'm not sure I can think of an extension that hasn't included a provision for the player to send money towards the Rays charity. Apparently the money would have to repaid to the players since the union is going to argue that the players should not be contractually obligated to donate to charity.
This should end well.