In NLRB v. Budd Mfg. Co., 169 F.2d 571, 577 (6th Cir. 1945), cert. denied, 335 U.S. 905, 69 S.Ct. 411, 93 L.Ed. 441 (1949), the Sixth Circuit Court of Appeals specifically rejected the notion that the protection afforded by the National Labor Relations Act is a constitutional right.