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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.
The regulators used antitrust laws to block the merger, believing it would eliminate competition. Usage notes. 1  In the United States, laws that prohibit monopolies are called antitrust laws; in other parts of the world, such laws are generally referred to as antimonopoly laws or competition laws. In the United States, laws that prohibit monopolies are called antitrust laws; in other parts of the world, such laws are generally referred to as antimonopoly laws or competition laws.