union, however, refused to negotiate with the petitioner, and declined to admit any of its employees to membership. Although petitioner’s services had been satisfactory, A & P, at the union’s instigation, cancelled its contract with petitioner in accordance with the obligations of its closed-shop agreement with the union. Later, the petitioner obtained a contract with a different company, but again at the union’s instigation, and upon the consummation of a closed-shop contract by that company with the union, petitioner lost that contract and business. Because of the union’s refusal to negotiate with the petitioner and to accept petitioner’s employees as members, the petitioner was unable to obtain any further hauling contracts in Philadelphia. The elimination of the petitioner’s service did not in any manner affect the interstate operations of A & P or other companies.
The petitioner then instituted this suit in a federal district court against respondents, the union and its representatives, praying for an injunction and asking for treble damages. Demurrers to the complaint were overruled, the case was tried, findings of fact were made, and the district court rendered a judgment for the respondents on the ground that petitioner had failed to prove a cause of action under the Anti-trust laws. 47 F. Supp. 571. The Circuit Court of Appeals affirmed, holding that the fact that respondents’ actions had caused petitioner to go out of business was not such a restraint of interstate commerce as would be actionable under the Sherman and Clayton Acts. 143 F. 2d 902. We granted certiorari because of the questions involved concerning the responsibility of labor unions under the Anti-trust laws.
The “destruction” of petitioner’s business resulted from the fact that the union members, acting in concert, refused to accept employment with the petitioner, and refused to admit to their association anyone who worked for petitioner. The petitioner’s loss of business is therefore