TVA faced multiple constitutional challenges. The Supreme Court of the United States ruled TVA to be constitutional in "Ashwander v. Tennessee Valley Authority", 297 U.S. 288 (1936). The Court noted that regulating commerce among the states includes regulation of streams and that controlling floods is required for keeping streams navigable; it also upheld the constitutionality of the TVA under the War Powers Clause, seeing its activities as a means of assuring the electric supply for the manufacture of munitions in the event of war. The argument before the court was that electricity generation was a "by-product" of navigation and flood control and therefore could be considered constitutional. The CEO of the Tennessee Electric Power Company (TEPCO), Jo Conn Guild, was vehemently opposed to the creation of TVA, and with the help of attorney Wendell Willkie, challenged the constitutionality of the TVA Act in federal court. The U.S. Supreme Court again upheld the TVA Act, however, in its 1939 decision "Tennessee Electric Power Company v. TVA". On August 16, 1939, TEPCO was forced to sell its assets, including Hales Bar Dam, Ocoee Dams 1 and 2, Blue Ridge Dam and Great Falls Dam to TVA for $78 million.