...2008 in Washington, DC. The subcommittee also heard testimony from the head of the NFL, NBA, NHL, MLB and their players' unions. (Photo by Chip Somodevilla/Getty Images

NHL, NBA, NFL and MLB union heads

WASHINGTON - FEBRUARY 27: Major League Baseball Player Association Executive Director Donald Fehr (L) and Major League Baseball Commissioner Bud Selig talk...

WASHINGTON - FEBRUARY 27: Major League Baseball Player Association Executive Director Donald Fehr (L) and Major League Baseball Commissioner Bud Selig talk...

...2008 in Washington, DC. The subcommittee also heard testimony from the head of the NFL, NBA, NHL, MLB and their players' unions

WASHINGTON - FEBRUARY 27: Major League Baseball Player Association Executive Director Donald Fehr (L) and Major League Baseball Commissioner Bud Selig talk...

...Rays in the first inning of game seven of the American League Championship Series during the 2008 MLB playoffs on October 19, 2008 at Tropicana Field in St Petersburg, Florida

CHICAG0 - SEPTEMBER 24: General view of the center field wall before the MLB game between the Cincinnati Reds and the Chicago Cubs on September 24, 2002 at Wrigley Field in...

MLB,NFL,NBA, and NHL referees

...New York on May 6, 2007. The Yankees defeated the Mariners 5-0. (Photo by Rich Pilling/MLB Photos via Getty Images

...the Mission Hills Resort on 21 November 2007 in Shenzhen, China. (Photo by Richard Heathcote/Getty Images) Major League Baseball Player Association Executive Director Donald Fehr (L) and Major League Baseball Commissioner Bud Selig talk...