The U.S. Constitution is a masterclass in euphemisms, carefully embedding protections for enslavement while scrubbing the text of the specific word for the practice. By framing those in bondage as "persons held to service or labour"[sic] or "all other persons," the Framers prioritized a legalistic definition of property that superseded individual liberty. This emphasis on property rights is most starkly evident in the clause of Article IV, which functioned as a constitutional mandate for the return of those who escaped their condition.:
Article IV, Section 2, Clause 3: No Person held to Service or Labour in one State, under the Laws thereof, escaping into another, shall, in Consequence of any Law or Regulation therein, be discharged from such Service or Labour, but shall be delivered up on Claim of the Party to whom such Service or Labour may be due. *
This provision effectively nationalized the enforcement of property interests, stripping "free" states of the power to liberate those who crossed their borders. Instead, it dictated that such persons must be "delivered up" to the claimant, ensuring that the economic assets of the owner were constitutionally shielded even in jurisdictions where the institution itself did not exist. Through this euphemistic framework, the document created a paradox where the protection of "property" necessitated the systematic dehumanization of the individual.
Several southern states wanted that provision codified. This clause was enforced by an act of Congress passed February 12, 1793, and signed by President Washington. It was the first fugitive slave law, and remained a part of the law for fifty-seven years. The first part of the act had to do with fugitives from justice. The last part was concerned with run-away slaves. Its provisions were reinforced by the Prigg decision that specified the federal role.
In the decades preceding the American Civil War, the federal government underwent a profound metamorphosis, shifting from neutrality toward becoming an "enforcement agent" for slaveholding interests. This transformation took place within a landscape characterized by the friction between the "presumption of freedom"—a cornerstone of Northern state law—and an increasingly aggressive federal mandate to protect Southern property rights in persons. As Northern jurisdictions attempted to safeguard their citizens through local due process, federal authorities prioritized the extra-territorial security of the slave system, effectively subordinating local sovereignty to the needs of the slave power. Prigg v. Pennsylvania (1842) effectively nationalized the law of slavery. By asserting exclusive federal jurisdiction over the return of fugitives, the American state reshaped the constitutional order, laying the institutional foundations for a federal sponsorship of slavery that would ultimately destabilize the Union it sought to preserve.
As noted by the historian Don Fehrenbacher, the transition was cemented by federal policy in the District of Columbia, where Congress maintained existing slave codes, and in the Western territories, where federally appointed officials frequently encouraged quasi-slavery systems. This infrastructure ensured that slavery was not a "peculiar" local exception but a federally endorsed national reality.
The constitutional crisis in Prigg was catalyzed by the 1837 seizure of Margaret Morgan, an incident that exposed the tragic human cost of legal ambiguity. The facts of the case challenged Pennsylvania’s 1826 Personal Liberty Law, revealing how the state's efforts to provide due process were systematically dismantled by federal interests.
Margaret Morgan’s parents were the slaves of a master named Ashmore, who, while never formally emancipating them, allowed them to live as free people beginning sometime before 1812. Ashmore "constantly declared he had set them free," and Margaret was born after this informal grant of liberty. In 1832, Margaret married Jerry Morgan, a free Black man, and the couple moved to Pennsylvania. During their residence there, they had several children who, as "begotten and born" on Pennsylvania soil, were free-born citizens under Commonwealth law.
Following Ashmore’s death, his estate passed to his niece, whose husband, Nathan Bemis, sought to reclaim Margaret. In February 1837, Bemis and Edward Prigg—a professional slave-catcher—traveled to Pennsylvania and seized Margaret and her family. While they initially sought a warrant from a local Justice of the Peace, Thomas Henderson, they were stymied when Henderson refused to issue the final removal papers, concluding he lacked jurisdiction. Henderson likely recognized that Margaret had entered Pennsylvania with her master's implicit permission and that her children were free-born. Disregarding the law, Prigg and his associates forcibly took the family to Maryland, where they were sold to a trader and shipped to the Deep South. In a tragic postscript, Jerry Morgan was killed while returning from a visit to the Pennsylvania Governor in a desperate, failed attempt to secure his family’s return.
Edward Prigg was subsequently indicted and convicted of kidnapping. However, through a "friendly" legal compromise between Maryland and Pennsylvania, both states agreed to expedite the case to the U.S. Supreme Court to resolve the constitutionality of the 1826 law. This single family’s tragedy—and the death of a father seeking justice—became the cold vehicle for Justice Story's sweeping nationalistic legal opinion that prioritized the judicial doctrine over the preservation of human liberty. It's also emblematic of the tension between originalism and living constitutionalism as one could argue that Story had no choice given the clear mandate to return fugitive slaves in the Constitution and tension between federal and states rights, i.e. northern personal liberty laws designed precisely to thwart the return of fugitive slaves and the federal constitutional obligation.
Justice Joseph Story occupied a fraught position as a "nationalist" jurist who personally loathed the institution of slavery while feeling legally bound to uphold its constitutional protections. Story frequently condemned the slave trade in his private correspondence and jury charges as a "monstrous" violation of natural law and justice. However, his judicial philosophy centered on the belief that the Constitution was a binding contract whose survival depended on strict adherence to its compromises. This tension is obvious in Prigg where he characterized the Fugitive Slave Clause as a "fundamental article" of the national compact, essential to the preservation of the Union. While he attempted to mitigate the impact of this ruling by suggesting that state officials were not required to assist in federal captures—giving rise to the "personal liberty laws" and providing an enormous loophole leading to the Fugitive Slave Act of 1850, more on that later—his ruling ultimately reinforced the federal government’s exclusive power to protect human property, illustrating a career-long struggle between personal morality and judicial duty.
The establishment of a "common-law right of self-help" effectively exported the law of the South into the jurisprudence of the North. By authorizing recapture "anywhere in the Union," the Court created a jurisdictional vacuum where state-level due process was replaced by private vigilante action. This rendered Northern states powerless to prevent the kidnapping of their own free Black citizens, as seen in the facts of the case where Margaret Morgan’s children, born free on Pennsylvania soil, were seized and carried into bondage. The decision effectively nationalized the Southern presumption of slave status, transforming the North into a hunting ground for the Southern master.
Despite the majority ruling, the Court was fractured by a strategic disagreement between the proponents of "federal exclusivity" and "concurrent power," and resulted in seven concurrent and dissenting opinions, unheard of in the early 19th century. (The decision itself was 8-1 with only Justice McClean dissenting.) Proslavery justices, including Roger B. Taney, Smith Thompson, and Peter V. Daniel, expressed profound apprehension that Story’s nationalist doctrine would make the 1793 Act a "dead letter" by allowing Northern states to withdraw their administrative cooperation. They argued instead for a concurrent state power that would permit Northern officials to assist masters in their claims.
Justice John McLean, however, issued a lone and vigorous dissent that prioritized the "Presumption of Freedom." "In a non-slaveholding state, every person is presumed to be free, regardless of color. This presumption stands until it is legally rebutted by the proof required under the Act of 1793" and he made the argument for state sovereignty and due process (I'm sure John Bingham was very familiar with this dissent and it showed in the 14th Amendment). McLean contended that while a master had a constitutional right to his property, he was bound to pursue the specific legal remedy provided by Congress rather than relying on extra-legal force.
Story's son, and Professor Goldstein tried to exonerate Story from history's backlash to the decision by arguing that Story sought to preserve the Union by limiting slaveholders to the "express bargains" of the Constitution. He defined slavery as a "mere municipal regulation" with no basis in natural law to limit its expansion beyond specific statutes. Yet, as H. Robert Baker suggests, Story may have been "fencing" with radical Southern constitutionalists. By establishing federal exclusivity, Story denied Southerners the right to claim slavery as a "natural property right" that the federal government was obligated to protect everywhere. He hoped that by centralizing the issue, a future Northern-led federal government could "remodel" the law to include habeas corpus and trial by jury.
Finkelman says, "nonsense." Story sought to nationalize the law of slavery to facilitate the recapture of fugitives and aggrandize federal power. He ignored the fact that Margaret Morgan's children were born free, sacrificing individual liberty for a nationalist victory. Story’s "secret" letter to Senator Berrien proposed a federal commissioner system to streamline slave capture. Story's children tried to suppress that letter.
Regardless of his motives, the result of Prigg was increased tensions between north and south as the northern states used the loophole to harass and thwart southern slave catchers, resulting in the Fugitive Slave Act of 1850.
The 1850 version was a radical expansion of federal power that fundamentally altered the legal landscape of the United States. While the 1793 act had been largely symbolic and difficult to enforce, the 1850 statute turned the federal government into an active agent for the recovery of human property.
The Act bypassed traditional courts by creating a new class of federal officers called Commissioners. These individuals had the power to grant certificates for the removal of a "fugitive" back to the South. This removed these cases from the jurisdiction of local judges who might be sympathetic to the accused.
In one of the most controversial sections of the law, Commissioners were paid $10 if they ruled in favor of the claimant (the owner) but only $5 if they ruled in favor of the accused. The official justification was that more paperwork was required for a removal certificate, but abolitionists pointed to this as a blatant federal bribe to ensure the return of individuals into bondage.
The law stripped the accused of nearly every legal protection: No Jury Trial: The Commissioner alone decided the person’s fate; No Right to Testify: The individual being claimed was legally prohibited from testifying on their own behalf; Cases were often decided based solely on an affidavit provided by the claimant, which the accused had no power to challenge.
The Act compelled ordinary citizens to participate in the capture of "fugitives." Federal marshals were authorized to "summon and call to their aid the bystanders" or a posse comitatus. Any citizen who refused to assist a marshal, or who helped an individual escape, faced a fine of $1,000 (a massive sum in 1850) and up to six months in prison.
By making the recovery of "property" a federal responsibility, the law effectively invalidated the "free" status of Northern states. It mandated that federal warrants be honored everywhere, meaning that an individual's legal status was no longer determined by the laws of the state where they lived, but by the laws of the state from which they had allegedly fled.
These provisions outraged free states. Resistance to the 1850 statute transformed from quiet defiance into organized, often militant, confrontation, as many Northerners viewed the law as a direct assault on their state sovereignty and moral conscience. The "Vigilance Committees" of cities like Boston and Philadelphia became the nerve centers of this movement, providing legal counsel, financial aid, and safe passage for those targeted by federal marshals. It provided justification for an expansion of the Underground Railroad.
Resistance frequently turned physical; in the Christiana Riot of 1851 and the rescue of Joshua Glover in Wisconsin, interracial crowds of abolitionists used force to liberate captives from federal custody, openly daring the government to enforce the "Bloodhound Law." By turning the act of capture into a public spectacle of violence and injustice, resistors successfully radicalized a previously moderate Northern public, shifting the debate from a legal dispute over property into a moral crisis that rendered the law virtually unenforceable in many regions. In addition, In response to the 1850 Act, several states passed new, even stricter laws that effectively made it a state crime for anyone—including private citizens—to assist in a federal capture.
In the 1859 decision of Ableman v. Booth, the Supreme Court issued a forceful defense of federal supremacy against state-level judicial resistance. The case arose after the Wisconsin Supreme Court declared the Fugitive Slave Act of 1850 unconstitutional and issued a writ of habeas corpus to release Sherman Booth, an abolitionist editor who had helped rescue a fugitive from federal custody. Chief Justice Roger B. Taney, writing for a unanimous Court, reversed the state’s decision, asserting that state courts have no authority to interfere with federal prisoners or overturn federal statutes. The ruling established a critical precedent for the hierarchy of the American legal system: while states are sovereign in their own sphere, they cannot use their judicial power to "nullify" federal law or obstruct the execution of federal warrants. It's also ironic in that this case is a rare instance where Northern states argued for "States' Rights" while the Taney Court—usually associated with Southern interests—insisted on absolute Federal Supremacy to protect the Fugitive Slave Act.
The legal developments of the antebellum era reveal a federal government that functioned consistently as an "extrajurisdictional agent" for the South. Through the jurisprudence of Prigg v. Pennsylvania, the Supreme Court effectively erased the personhood of those seized, replacing state-level protections with a nationalized "vigilante’s license." Justice Story’s brand of judicial nationalism attempted to "preserve the Union" by centralizing the issue of slavery, yet in doing so, he removed the safety valves of state sovereignty that protected free Black citizens.
By stripping Northern states of their power to uphold the presumption of freedom and subordinating "Revolutionary idealism" to the protection of property, the federal government did not save the Union—it accelerated its fracturing. The prioritization of slaveholding interests over individual liberty ensured that the conflict could no longer be contained within the sterile halls of the Court. In seeking to build a federal shield for slavery, the judiciary and the executive branch instead forged the very weapons that would eventually dismantle the constitutional order they sought to protect.
* The original Constitution used the traditional British spellings.
Sources:
Ableman v. Booth, 62 U.S. 506 (1858)
Baker, H. R. (2014). A better story in Prigg v. Pennsylvania? Journal of Supreme Court History, 39(2), 169-189. https://doi.org/10.1353/sch.2014.0011
Coles, N. A., & Masurek, S. J. (2014). An analysis of the Fugitive Slave Act: When Congress passed on act that violated the American constitution.
Fehrenbacher, D. E. (1978). The Dred Scott case: Its significance in American law and politics. (Chapter on Prigg)
Finkelman, P. (1997). Prigg v. Pennsylvania understanding justice story's Proslavery nationalism. Journal of Supreme Court History, 22(2), 51-64. https://doi.org/10.1111/j.1540-5818.1997.tb00111.x
Goldstein, L. F. (2011). A "Triumph of Freedom" After All? Prigg v. Pennsylvania Re-examined. Law and History Review, 29(3), 763–796.
Maltz, E. M. (2010). Fugitive slave on trial: The Anthony burns case and abolitionist outrage.
(n.d.). New York State Parks, Recreation & Historic Preservation. https://parks.ny.gov/sites/default/files/FugitiveSlaveAct1793.pdf
Prigg v. Pennsylvania, 41 U.S. 539 (1842) https://supreme.justia.com/cases/federal/us/41/539/
Prigg v. Pennsylvania and the Fugitive Slave Act of 1850. (2024). Fugitive Slave on Trial, 15-29. https://doi.org/10.2307/jj.13168062.6
Waldstreicher, D. (2010). Slavery's constitution: From revolution to ratification. Macmillan.