boycott

transitive verb | \ ˈbȯi-ˌkät \ | boy·cott

1. : to engage in a concerted refusal to have dealings with (as a store, business, or organization) usually to express disapproval or to force acceptance of certain conditions — see also primary boycott, secondary boycott

   Note: A boycott of a business by its competitors, suppliers, or buyers that has the effect of preventing the business's access to the market is a violation of the Sherman Antitrust Act.