Businesses that sell insurance have a special limited exemption due to the effect of another federal law, the McCarran-Ferguson Act, 15 U.S.C. §§ 1011-1015. The McCann-Ferguson Act exempts the business of insurance from most federal regulation, including the FTC Act and (by extension) the TSR. The McCarran–Ferguson Act does not itself regulate insurance, but rather it allows states the freedom to regulate that business