Plaintiffs who sue under section 1 of the Sherman Act must allege a contract, combination, or conspiracy that restrains competition.  Some kinds of conspiracies so patently harm competition that courts presume injury and call them "per se" violations.  Agreements between competitors to fix prices, not to compete for specific customers or in particular areas, and to boycott

Arctic Glacier, the U.S. unit of a Manitoban outfit, pleaded guilty to violating section 1 of the Sherman Act.  It confessed to conspiring with rival ice-makers not to vie for customers in Detroit and southeastern Michigan.  The Antitrust Division of the U.S. Department of Justice said:

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