In Bus Employees v. Wisconsin Board, 340 U.S. 383, this Court held that the Wisconsin Public Utility Anti-Strike Law, which made it a misdemeanor for public utility employees to engage in a strike which would cause an interruption of an essential public utility service, conflicted with the National Labor Relations Act and was therefore invalid under the Supremacy Clause of the Constitution.
In Rabouin v. N.L.R.B., 195 F.2d 906 (2nd Cir., 1962), Justice Clark, then a Circuit Judge, specifically held that a union's demand for damages equal in amount to the wages paid a non-union driver was not an attempted exaction in violation of § 8(b)(6).