Master The Supreme Court upheld an Oregon law limiting women's working hours, endorsing sex-specific labor protections and pioneering the use of social science in constitutional litigation. with this comprehensive case brief.
Muller v. Oregon is a landmark 1908 Supreme Court decision that carved a high-profile exception to the Lochner-era emphasis on freedom of contract by upholding a statute that limited women's working hours in certain industries. While the Court had recently struck down a maximum-hours law for bakers in Lochner v. New York, it validated Oregon's maximum-hours law for women on the ground that women's health and maternal functions constituted a distinct public interest within the state's police power. The case is famous for Louis Brandeis's innovative brief marshalling extensive social science and medical data—an approach that reshaped advocacy and judicial receptivity to empirical evidence in constitutional law.
At the same time, Muller is deeply controversial. Its reasoning relies on paternalistic, sex-based assumptions about women's physical structure, bargaining power, and role as "mothers of the race," rationales that modern equal protection doctrine rejects. For law students, Muller illustrates the interplay between substantive due process and the police power in the early 20th century, the strategic use of legislative facts in constitutional adjudication, and the evolution from protective labor laws to anti-stereotyping principles in sex discrimination jurisprudence.
Muller v. Oregon, 208 U.S. 412 (1908) (U.S. Supreme Court)
In 1903, Oregon enacted a statute providing that no female should be employed in any mechanical establishment, factory, or laundry for more than ten hours in any one day. Curt Muller owned the Grand Laundry in Portland. He was charged and convicted of violating the statute for requiring a female employee to work more than ten hours in a single day. Muller challenged the law as an unconstitutional infringement on the liberty of contract protected by the Fourteenth Amendment's Due Process Clause, invoking the Supreme Court's recent decision in Lochner v. New York, which had invalidated a maximum-hours law for bakers as lacking a sufficient connection to health. Oregon defended its statute as a valid exercise of the police power to protect the health and welfare of women workers, submitting a brief by Louis D. Brandeis that compiled extensive social science, economic, and medical data on the deleterious health effects of long working hours on women and consequent societal impacts.
Does an Oregon statute limiting women to a maximum of ten hours of work per day in certain industries unconstitutionally interfere with freedom of contract under the Fourteenth Amendment, or is it a valid exercise of the state's police power to protect health and welfare?
Under the state's police power, a law that reasonably relates to the protection of health, safety, and welfare may limit contractual freedom without violating the Due Process Clause. In evaluating maximum-hours regulations, the Court will consider the nature of the occupation and the class of workers affected; where real differences exist that bear on health and welfare—here, the recognized physical differences and maternal functions of women—sex-specific maximum-hours laws may be sustained as reasonable health measures.
The Oregon law limiting women to a ten-hour workday in specified industries is constitutional as a reasonable health regulation under the state's police power; Muller's conviction was affirmed.
Writing for a unanimous Court, Justice Brewer acknowledged the Lochner principle that the Fourteenth Amendment protects liberty of contract but emphasized that this liberty is not absolute and must yield to reasonable health and welfare regulations. The Court analogized to Holden v. Hardy, which upheld maximum hours for miners due to particular health hazards, and distinguished Lochner on the ground that bakers did not occupy a class whose health risks from hours were sufficiently established. The Court accepted the premise—supported in the Brandeis Brief's legislative facts—that women's "physical structure" and "maternal functions" render them more susceptible to the harms of long working hours, and that these harms implicate not only individual health but broader social interests in the wellbeing of future generations. It also reasoned that women's comparatively limited bargaining power in the labor market warranted special protection. On these grounds, the Court held the ten-hour limitation to be a reasonable, narrowly targeted health measure in factories, mechanical establishments, and laundries, rather than an impermissible interference with contract. While acknowledging potential economic burdens, the Court prioritized the state's interest in protecting women's health and the public welfare over unfettered contractual freedom. The opinion thus rested on two pillars: (1) deference to states' police powers where a clear nexus exists between the regulation and health, and (2) acceptance of sex-based distinctions where the legislature relied on empirical materials and widely held social understandings of the time regarding women's physical differences and societal roles.
Muller is significant for three reasons. First, it marks a prominent departure from the strict Lochner-era protection of contractual liberty by recognizing broad state authority to enact health-driven labor protections. Second, it pioneered the use of empirical "legislative facts" in constitutional adjudication through the Brandeis Brief, influencing how lawyers and courts incorporate social science in constitutional cases. Third, it exposes the limits and risks of protective labor jurisprudence: the Court's endorsement of sex-based paternalism later collided with modern sex equality principles under the Equal Protection Clause and statutory antidiscrimination regimes. While Muller paved the way for upholding some labor protections (and foreshadowed decisions like Bunting v. Oregon and West Coast Hotel v. Parrish), its sex-specific rationale was undermined by later cases such as Reed v. Reed, Frontiero v. Richardson, Craig v. Boren, and United States v. Virginia, and by statutes like Title VII of the Civil Rights Act of 1964.
The Brandeis Brief, filed by Louis D. Brandeis for Oregon, compiled extensive social science, medical, and economic data to show the health harms of long working hours for women. It shifted appellate advocacy away from purely doctrinal argument toward empirical support for legislative judgments, and the Court explicitly relied on these legislative facts. This method influenced future constitutional litigation across subject areas.
Lochner struck down a maximum-hours law for bakers as an unjustified interference with freedom of contract. Muller distinguished Lochner by emphasizing women's distinct health concerns and maternal functions, accepting that the state's police power could validly limit women's working hours as a health measure. Thus, Muller functioned as an exception within the Lochner era, sustaining a labor regulation due to the class affected.
Muller's core holding that states may regulate working hours under the police power remains consistent with modern deference to economic regulation. However, its sex-based rationale—that women require special protection due to inherent physical differences and maternal roles—has been repudiated by modern equal protection doctrine, which applies at least intermediate scrutiny to sex classifications (e.g., Craig v. Boren) and rejects laws based on overbroad gender stereotypes (e.g., United States v. Virginia).
Bunting v. Oregon (1917) upheld general maximum-hours laws applicable to all workers, signaling broader acceptance of hours regulation. Adkins v. Children's Hospital (1923) later struck down a women-only minimum wage, but West Coast Hotel v. Parrish (1937) overruled Adkins and embraced deference to wage and hour laws. Modern equal protection cases—Reed v. Reed, Frontiero v. Richardson, Craig v. Boren, and United States v. Virginia—undercut Muller's sex-specific logic.
The Court did not use modern tiers of scrutiny. Instead, it applied a deferential reasonableness test under the police power, asking whether the regulation bore a real and substantial relation to health and welfare. It credited empirical materials about women's health and roles to find the law reasonable. Today, economic regulation typically receives rational basis review, while sex classifications receive intermediate scrutiny.
Muller v. Oregon simultaneously broadened the constitutional space for labor protections and entrenched gendered assumptions. By accepting a sex-specific hours law as a valid health measure, the Court softened Lochner-era constraints on the police power and set an influential precedent for the use of social science in constitutional litigation. That methodological legacy endures in areas ranging from equal protection to substantive due process.
Yet Muller's reasoning rests on paternalistic premises about women's fragility and maternal roles that modern law rejects. For students and lawyers, the case is a study in how constitutional doctrine evolves with social understandings: it highlights both the strategic power—and the normative perils—of empirical legislative facts, and it foreshadows the Court's later shift from protective labor paternalism to robust anti-stereotyping principles under the Equal Protection Clause.
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