A labor dispute between the National Football league and the union representing its referees reached a fever pitch Monday night during a game between the Seattle Seahawks and the Green Bay Packers when substitute referees failed to call pass interference before a last-second touchdown. The play ended the game in favor of the Seahawks, when many argue it should have gone the other way. The play focused attention on the NFL's decision to use substitute referees after it locked out the regular professionals over a dispute about pension plans and compensation. We're joined by sportswriter Dave Zirin.