278 U.S. 294 278 U.S. 294 49 S.Ct. 100 73 L.Ed. 387 UNITED STATESv.CARVER et al. No. 78. Argued Nov. 28, 1928. Decided Jan. 2, 1929. Under Act June 15, 1917, c. 29, par. (b), 40 Stat. 182, authorizing the President to modify, suspend, cancel, or requisition contracts for building, production, or purchase of ships […]