Federal regulation— No Act of Congress shall be construed to invalidate, impair, or supersede any law enacted by any State for the purpose of regulating the business of representing buyers and sellers in the real estate transactions commonly understood and regulated and licensed by States as the business of State licensed real estate brokers or their salespersons or any trade association to which they may belong, or which imposes a fee or tax upon such business, unless such Act specifically relates to the business of commonly regulated and licensed by States as the profession of State licensed real estate brokers or their salespersons or any trade association to which they may belong: Provided, That after the date of enactment of this Act, the Act of July 2, 1890, as amended, known as the Sherman Act, as amended, and the Act of October 15, 1914, as amended, known as the Clayton Act, and the Act of September 26, 1914, known as the Federal Trade Commission Act, as amended (
15 U.S.C. 41 et seq.), shall be applicable to the business of representing buyers and sellers in the real estate transactions commonly understood and regulated and licensed by states as the business of State licensed real estate brokers or their salespersons or any trade association to which they may belong to the extent that such business is not regulated by State law.