The McCarran–Ferguson Act, 15 U.S.C. §§ 1011-1015, is a United States federal law that exempts the business of insurance from most federal regulation, including federal antitrust laws to a limited extent. The McCarran–Ferguson Act was passed by the 79th Congress in 1945 after the Supreme Court ruled in "United States v. South-Eastern Underwriters Association" that the federal government could regulate insurance companies under the authority of the Commerce Clause in the U.S. Constitution and that the federal antitrust laws applied to the insurance industry.