In the latter part of 1951, a dispute arose between the steel companies and their employees over terms and conditions that should be included in new collective bargaining agreements. Long-continued conferences failed to resolve the dispute. On December 18, 1951, the employees’ representative, United Steelworkers of America, C.I.O., gave notice of an intention to strike when the existing bargaining agreements expired on December 31. The Federal Mediation and Conciliation Service then intervened in an effort to get labor and management to agree. This failing, the President on December 22, 1951, referred the dispute to the Federal Wage Stabilization Board to investigate and make recommendations for fair and equitable terms of settlement. This Board’s report resulted in no settlement. On April 4, 1952, the Union gave notice of a nation-wide strike called to begin at 12:01 a.m. April 9. The indispensability of steel as a component of substantially all weapons and other war materials led the President to believe that the proposed work stoppage would immediately jeopardize our national defense and that governmental seizure of the steel mills was necessary in order to assure the continued availability of steel. Reciting these considerations for his action, the President, a few hours before the strike was to begin, issued Executive Order 10340. The order directed the Secretary of Commerce to take possession of most of the steel mills and keep them running. The Secretary immediately issued his own possessory orders, calling upon the presidents of the various seized companies to serve as operating managers for the United States. They were directed to carry on their activities in accordance with regulations and directions of the Secretary. The next morning the President sent a message to Congress reporting his action. Twelve days later he sent a second message. Congress has taken no action.
Obeying the Secretary’s orders under protest, the companies brought proceedings against him in the District Court. Their complaints charged that the seizure was not authorized by an act of Congress or by any constitutional provisions. . . . Holding against the Government on all points, the District Court on April 30 issued a preliminary injunction restraining the Secretary from ‘continuing the seizure and possession of the plant * * * and from acting under the purported authority of Executive Order No. 10340.’ On the same day the Court of Appeals stayed the District Court’s injunction. Deeming it best that the issues raised be promptly decided by this Court, we granted certiorari on May 3 and set the cause for argument on May 12. . . .