Incompetition law, agroup boycott is a type ofsecondary boycott in which two or morecompetitors in arelevant market refuse to conduct business with a firm unless the firm agrees to cease doing business with an actual or potential competitor of the firms conducting the boycott.^[1] It is a form ofrefusal to deal, and can be a method of shutting a competitor out of a market, or preventing entry of a new firm into a market.

In the United States, such conduct can be held to violate theSherman Antitrust Act. Depending upon the nature of the boycott, the courts may apply therule of reason, a quick look analysis, or hold that the boycott isillegalper se. There is a presumption in favor of a rule of reason standard.^[2][3] It may also be considered a form ofcivil conspiracy.

• Freedom of association – Right to collective action
• Primary boycott – Voluntary abstention from using a product or servicePages displaying short descriptions of redirect targets
• Refusal to deal – Potentially unlawful anti-competitive practice
• Secondary boycott – Action in support of another disputantPages displaying short descriptions of redirect targets

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