In Allgeyer v. Louisiana, the U.S. Supreme Court ruled in favor of Allgeyer & Co., a New Orleans-based cotton firm that had violated a Louisiana law prohibiting out-of-state insurance contracts not approved by state officials. The court held that the 14th Amendment's Due Process Clause protected an individual’s liberty to enter into contracts without unreasonable interference from the government, thus establishing what is known as "substantive due process." This was one of the first cases where substantive due process was used to strike down a state statute and it set precedent for future rulings on economic regulation and personal liberties under this doctrine.

The dissenting opinion in the Allgeyer v. Louisiana case was not recorded or does not exist. The Supreme Court decision, which ruled 6-2 in favor of Allgeyer, did not include a published dissent from the two justices who voted against it. Therefore, there is no available summary for a dissenting opinion for this particular case.