To what degree did the United States v. E.C. Knight Company (1895) and Hammer v. Dagenhart, (1918) limit the power of Congress under the Commerce Clause?

2. To what degree did the cases post-1937, during the FDR years, change the definition of Congressional Commerce Clause power? Explain with reference to National Labor Relations Board v. Jones & Laughlin Steel Corporation (1937), Wickard v. Filburn (1942), and United States v. Darby (1942)