The Slaughter-House Cases, 83 U.S. (16 Wall.) 36 (1873), was a landmark U.S. Supreme Court decision which ruled that the Privileges or Immunities Clause of the Fourteenth Amendment to the U.S. Constitution only protects the legal rights that are associated with federal U.S. citizenship, not those that pertain to state citizenship. Though the decision in the Slaughter-House Cases minimized the impact of the Privileges or Immunities Clause on state law, the Supreme Court would later incorporate the Bill of Rights to strike down state laws on the basis of other clauses. In 2010, the Court rejected arguments in McDonald v. Chicago to overrule the established precedent of Slaughterhouse and decided instead to incorporate the Second Amendment via the Due Process Clause of the Fourteenth Amendment.
Ostensibly seeking to improve sanitary conditions, the Louisiana legislature and the city of New Orleans had established a corporation charged with regulating the slaughterhouse industry. Members of the Butchers' Benevolent Association challenged the constitutionality of the corporation's monopoly, claiming that it violated the Fourteenth Amendment. The amendment had been ratified in the aftermath of the American Civil War with the primary intention of protecting civil rights of millions of newly emancipated freedmen in the Southern United States, but the butchers argued that the amendment protected their right to "sustain their lives through labor".