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United States antitrust law. United States antitrust law is a collection of federal and state government laws that regulates the conduct and organization of business corporations, generally to promote fair competition for the benefit of consumers.
DEFINITION of 'Clayton Antitrust Act'. An amendment passed by the U.S. Congress in 1914 that provides further clarification and substance to the Sherman Antitrust Act of 1890. The Clayton Antitrust Act attempts to prohibit certain actions that lead to anti-competitiveness.