The National Football League Players Association is suing the NFL Coaches Association for around $650,000. The Players Association says that they loaned the money to the Coaches Association, and that they want the money repaid. The lawsuit also asks that the court determine if the president of the Coaches Association was appropriately elected. The Coaches Association says that the Players Association wants to control them.
See "NFL players' union sues coaches' union in DC court", The Associated Press, CBS News, April 19, 2012