Mugler v. Kansas was a United States Supreme Court case that addressed the issue of whether a state could prohibit the manufacture and sale of intoxicating liquors within its borders. The case was brought by a Kansas resident, John Mugler, who was charged with violating the state's prohibition law. Mugler argued that the law was unconstitutional because it violated the Fourteenth Amendment's Due Process Clause. The Supreme Court held that the law was constitutional. The Court reasoned that the state had a legitimate interest in protecting the health and welfare of its citizens, and that the law was a reasonable means of achieving that goal. The Court also noted that the law did not violate the Due Process Clause because it did not interfere with any fundamental right. The Court's decision in Mugler v. Kansas established that states have the power to regulate the manufacture and sale of intoxicating liquors within their borders. This decision has been cited in numerous subsequent cases involving the regulation of alcohol.

Justice Field delivered the dissenting opinion in Mugler v. Kansas, arguing that the state of Kansas had violated the Fourteenth Amendment by enacting a law prohibiting individuals from manufacturing and selling intoxicating liquors without first obtaining a license from the state. He argued that this was an unconstitutional infringement on personal liberty and property rights because it deprived people of their right to engage in lawful occupations free from unreasonable government interference. Furthermore, he argued that such laws were not necessary for public safety or health as there were already existing common-law remedies available to address any issues related to intoxication or disorderly conduct caused by alcohol consumption. Justice Field concluded his dissent by stating that while states have broad police powers over matters affecting public welfare, they cannot use those powers to infringe upon individual liberties guaranteed under the Constitution.