In Sinclair Refining Co. v. Atkinson et al., the U.S. Supreme Court ruled in favor of Atkinson, upholding a lower court's decision that Sinclair had violated an injunction prohibiting it from encouraging strikes or work stoppages at its plants during contract negotiations with labor unions. The case centered on whether the Norris-LaGuardia Act, which limited federal courts' power to issue injunctions in labor disputes, applied to this situation. The majority held that it did and thus reversed a previous ruling by the Fifth Circuit Court of Appeals which had found for Sinclair based on its interpretation of "yellow dog" contracts (agreements between workers and employers where employees agree not to join a union). In essence, this landmark case clarified how far companies could go in trying to prevent their workers from striking and affirmed limitations on judicial intervention in labor disputes.

In the dissenting opinion for Sinclair Refining Co. v. Atkinson, Justice Frankfurter argued that the Norris-LaGuardia Act should not be interpreted to prohibit federal courts from issuing injunctions in labor disputes involving breaches of collective bargaining agreements. He contended that such an interpretation would undermine the national policy favoring peaceful resolution of industrial disputes through collective bargaining, as established by the National Labor Relations Act and other federal laws. Furthermore, he believed it was inconsistent with previous Supreme Court decisions which had upheld court-issued injunctions in similar cases. In his view, allowing unions to breach their contracts without fear of judicial intervention could lead to chaos and instability in labor relations.