FILE - In this April 25, 2014, file photo, Northwestern football player Shane Mertz walks into McGaw Hall, where voting is taking place on whether to form the nation's first union for college athletes, in Evanston, Ill. The National Labor Relations Board on Monday, Aug. 17, 2015, overturned a historic ruling that gave Northwestern University football players the go-ahead to form the nation's first college athletes' union, saying the prospect of union and non-union teams could throw off the competitive balance in college football.(AP Photo/Charles Rex Arbogast, File)