Over the past few days, the National Football League revealed that it was voluntarily relinquishing its status as a tax-exempt entity. This is a threat that members of Congress have levied at the league every so often in retaliation for some concern or another over the years.
The NFL has maintained a tax-exempt status for the better part of its existence, since the 1940s, but with its relinquishing of its status, only the NHL of the major American sports leagues remains tax-exempt. The MLB gave up its status back in 2007, while the NBA had already been a tax-filing organization.