In the case of Mulford et al. v. Smith et al., 1938, the United States Supreme Court was asked to determine whether a New York state law that regulated and taxed farmers' cooperative associations violated the Commerce Clause of the U.S. Constitution by interfering with interstate commerce. The plaintiffs were members of such an association who argued that they should not be subject to these regulations and taxes because their activities constituted interstate commerce, which is under federal jurisdiction according to the Commerce Clause. The court ruled in favor of Smith (the defendant), upholding New York's right to regulate and tax these associations as part of its power over intrastate commerce - business conducted entirely within state borders - even though some aspects involved out-of-state transactions or products from other states being sold in New York markets. This decision affirmed states' rights to regulate local economic activities while also recognizing federal authority over broader commercial interactions crossing state lines.

In the dissenting opinion for Mulford et al. v. Smith et al., Justice Black argued that the Agricultural Adjustment Act of 1938 was unconstitutional as it violated both the Fifth and Tenth Amendments. He believed that Congress had overstepped its bounds by regulating agricultural production, a matter he considered to be under state jurisdiction according to the Constitution's Commerce Clause. Furthermore, he contended that this act unfairly deprived farmers of their property without due process or just compensation by imposing penalties on those who exceeded government-imposed quotas on crop production. This, in his view, amounted to an unlawful taking of private property by the federal government which is prohibited under Fifth Amendment protections against such actions.