Covington & Burling, Proskauer Rose, and Skadden, Arps, Slate, Meagher & Flom have formed something of a triumvirate when it comes to representing major professional sports leagues, including the National Football League, whose nonprofit status was recently criticized by U.S. Senator Tom Coburn as part of his crusade against federal government waste.

Coburn’s Waste Book 2012 states that taxpayers are losing out on at least $91 million in revenue from tax loopholes that allow pro sports leagues such as the NFL, National Hockey League, National Lacrosse League, and The Professional Golfers’ Association of America to classify themselves as nonprofit organizations.