On April 25, 1938, the Supreme Court issued a 6–2 decision in favor of Erie Railroad, overruling
Swift v. Tyson and holding that, when
sitting in diversity, U.S. federal courts must apply state law instead of "general federal common law".
Opinion of the Court For the purposes of the decision's core holding, six justices formed the majority and joined an opinion written by justice
Louis Brandeis. The Court began by framing the case around the question of "whether the oft-challenged doctrine of
Swift v. Tyson shall now be disapproved." The Court first reviewed the history of the
Swift doctrine. It referenced the research of American legal scholar
Charles Warren, who in a 1923
Harvard Law Review article had published evidence of an earlier draft of the Rules of Decision Act that explicitly included states' common laws in its definition of "the laws of the several states". The Court concluded that Warren's discovery proved that the
Swift Court's interpretation of the Act had been "erroneous". The Court next explained that the
Swift doctrine had not produced the legal uniformity the Court had hoped it would, but had instead allowed litigants from other states to discriminate against other litigants in their home states. The Court said that because the
Swift doctrine dictated that a lawsuit between two in-state parties would be decided under state law while an identical lawsuit between an in-state party and an out-of-state party would be decided under federal common law, the
Swift doctrine was allowing plaintiffs to manipulate which law would be applied to their lawsuits by strategically filing them in specific state or federal courtsa practice now known as "
forum shopping". The Court decried this practice, saying that it allowed plaintiffs to introduce "grave discrimination" against parties from other states. Furthermore, the Court held that the
Swift doctrine had not only been a "social and political" failure, but had also been unconstitutional. Having determined that the
Swift doctrine was unconstitutional, the opinion's third section declared that there is no general U.S. federal common law, and that U.S. federal courts hearing cases under diversity-of-citizenship jurisdiction must apply state laws as construed by state supreme courts. The Court emphasized that its ruling was not meant to strike down any federal laws, but was only intended to "declare that in applying the [
Swift] doctrine this Court and the lower courts have invaded rights which in our opinion are reserved by the Constitution to the several States." Applying its holding to the facts of Tompkins's case, the Court held that both the district court and the Second Circuit had erred by not applying Pennsylvania law to Tompkins's claim against Erie Railroad. The Court reversed the Second Circuit's decision and
remanded the case, instructing the court to determine whether the railroad company's interpretation of Pennsylvania law had been correct.
Reed's concurrence in the judgment Justice
Stanley F. Reed concurred only in the judgment. Reed agreed with the Court's core holding that
Swift v. Tyson should be overruled and that federal courts should apply state law when deciding cases under diversity jurisdiction. Reed disagreed with the Court's conclusion that the
Swift doctrine was unconstitutional, however, saying instead it had been merely an erroneous interpretation of the Rules of Decision Act.
Butler's dissent Justice
Pierce Butler filed a
dissenting opinion, joined by Justice
James McReynolds, in which he argued the majority had engaged in
judicial activism. He asserted the majority had completely rewritten the two questions presented in the petition for
certiorari as a constitutional question, when there really was no constitutional issue. He pointed out that no one in this case had directly challenged the
Swift regime, which the Court had adhered to for so long in so many cases. ==Aftermath==