National Labor Relations Board v. Jones & Laughlin Steel Corporation, 301 U.S. 1 (1937)
The case was to determine if the National Labor Relations Act of 1935 was constitutional.
NLRB was upheld. Chief Justice Charles Evans Hughes wrote, "Although activities may be intrastate in character when separately considered, if they have such a close and substantial relation to interstate commerce that their control is essential or appropriate to protect that commerce from burdens and obstructions, Congress cannot be denied the power to exercise that control." Their decision reversed a lower court ruling.