In the case of International Longshoremen's & Warehousemen's Union et al. v. Juneau Spruce Corp., 1951, the U.S Supreme Court ruled in favor of Juneau Spruce Corporation, a lumber company that had suffered financial losses due to a labor strike by members of the International Longshoremen’s and Warehousemen’s Union (ILWU). The ILWU argued that they were immune from liability under federal law for damages caused by their strike actions. However, the court disagreed with this argument and held that unions could be held liable for damages resulting from strikes if those strikes violated contracts between employers and employees or interfered with interstate commerce. This decision was significant as it clarified union responsibilities during industrial disputes and established limits on union immunity under federal law.

In the dissenting opinion for International Longshoremen's & Warehousemen's Union et al. v. Juneau Spruce Corp., Justice Black argued that the majority decision was a departure from established principles of labor law and an unwarranted intrusion into the jurisdiction of National Labor Relations Board (NLRB). He contended that Congress had entrusted NLRB with primary responsibility to prevent unfair labor practices, not courts. The union’s conduct in this case, he believed, should have been addressed by NLRB rather than through litigation in federal court under Sherman Act or Clayton Act as it involved issues related to collective bargaining agreements and strikes - matters within NLRB’s expertise. Furthermore, he expressed concern about potential chilling effect on legitimate union activities due to fear of massive damage awards under antitrust laws which were designed primarily for business monopolies not labor unions.