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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.
adj. 1  Opposing or intended to regulate business monopolies, such as trusts or cartels, especially in the interest of promoting competition: antitrust legislation. 2  opposing or intended to restrain trusts, monopolies, or other large combinations of business and capital, esp. to promote competition: antitrust laws.