James Clark McReynolds,
National Fertilizer Association v…
“ Eddy et al., 249 U.S. 427, 431, 432, 39 S.Ct. 325, 327, 63 L.Ed. 689. 'The right of a manufacturer to maintain secrecy as to his compounds and processes must be held subject to the right of the state, in the exercise of its police power and in promotion of fair dealing, to require that the nature of the product be fairly set forth.' And the same principle is broad enough to meet the further claim of right to sell products manufactured prior to the passage of the amending act of 1936. ”
