Prigg v. Pennsylvania
The Court struck down a Pennsylvania law that made it a crime to forcibly remove a Black person from the state for enslavement, ruling that the Constitution's fugitive-slave clause gave slaveholders an unconditional right to recapture escaped enslaved people in any state, a right state law could not restrict.
The decision also held that Congress alone, not the states, could pass laws to enforce that right, a ruling that would soon push several northern states to withdraw their own officials from helping catch runaways and deepen the sectional conflict over slavery in the years before the Civil War.
“The clause manifestly contemplates the existence of a positive, unqualified right on the part of the owner of the slave, which no state law or regulation can in any way qualify, regulate, control, or restrain.”
Story's core holding that the fugitive-slave clause creates an absolute right immune from state regulation.
How it got here: A Pennsylvania county court convicted Prigg on a special jury verdict; Pennsylvania's Supreme Court affirmed pro forma by agreement of Maryland and Pennsylvania to obtain a definitive federal ruling.
The Case in Depth
What happened
Margaret Morgan, an enslaved woman held by Margaret Ashmore of Maryland, escaped to Pennsylvania in 1832. In 1837 Edward Prigg, acting as Ashmore's agent, seized Morgan and her children (one born free in Pennsylvania) and took them to Maryland without following Pennsylvania's legal process. Pennsylvania indicted Prigg under an 1826 state law criminalizing the forcible removal of Black people for enslavement.
The question before the Court
Could Pennsylvania punish a slave owner's agent for forcibly seizing an escaped enslaved woman and carrying her back to Maryland, under a state law meant to stop kidnapping?
Why it matters
The ruling voided a wave of state "personal liberty" and anti-kidnapping laws that free states had used to slow the recapture of escaped enslaved people, and it stripped states of authority to regulate the process even to protect free Black residents from wrongful seizure. It also, paradoxically, told states they need not lend their officers to help catch runaways, prompting northern states to pull back state cooperation altogether.
What changes now
The Court reversed the Pennsylvania Supreme Court and itself entered a judgment of not guilty for Prigg, remanding the case to Pennsylvania's courts with directions to carry that judgment into effect. The ruling was final on the merits, leaving no further proceedings on Prigg's guilt. In practice, many northern states responded to the decision's suggestion that they were not obligated to have their officers assist in captures by passing new laws withdrawing state cooperation from federal fugitive-slave enforcement, intensifying the sectional dispute that the decision was meant to resolve.
What this does not decide
The majority opinion, echoed in several concurrences, stopped short of ruling that state officials are required to help enforce the federal fugitive-slave law; it said state magistrates could act "if they choose" unless a state forbade it. This left open, and later fueled, the question of whether states could lawfully refuse all state assistance to slaveholders.
Concurrences and dissents
Concurrence — Justice Taney
Taney agreed the Pennsylvania law was unconstitutional but rejected the majority's view that Congress's power was exclusive. He argued states were not merely permitted but duty-bound to pass laws supporting a master's right to recapture a fugitive slave, so long as those laws did not conflict with the 1793 Act, comparing it to states enforcing other constitutionally guaranteed individual rights like contract protections.
Concurrence — Justice Thompson
Thompson concurred in reversing the conviction but disagreed that congressional power over the subject was exclusive. He reasoned that if Congress ever repealed the 1793 Act, states could and should legislate to fulfill the constitutional guarantee themselves, since the Constitution only voided state laws that impaired the master's right, not laws that reinforced it.
Concurrence — Justice Baldwin
Baldwin agreed the Pennsylvania statute was unconstitutional on the narrow ground that, since Morgan's status as a slave was admitted, her removal could not legally be 'kidnapping.' He otherwise rejected the Court's broader reasoning about exclusive federal power and state authority.
Concurrence — Justice Wayne
Wayne fully endorsed Story's opinion and wrote separately mainly to summarize its holdings point by point, emphasizing that Congress's power over fugitive-slave enforcement was exclusive and that this did not intrude on states' police powers over disorder within their borders.
Concurrence — Justice Daniel
Daniel agreed the Pennsylvania law was invalid but strongly objected to the majority's broad ruling that congressional power was exclusive of all state action. He argued that states could pass laws genuinely aiding, rather than undermining, a slaveholder's constitutional right, and that treating the power as exclusive would strip fugitives' pursuers of help they needed while traveling through multiple states.
Concurrence — Justice McLean
McLean agreed Pennsylvania's law was unconstitutional and that Congress's power to legislate on fugitive recovery was exclusive, but he broke from the majority on one key point: he argued a master could not simply seize a fugitive and forcibly remove her from a state without first bringing her before a judge or magistrate as required by the 1793 Act, and that states could still punish forcible removals made without that process.
How the Court got there
The legal reasoning, step by step
- The Court read the Constitution's fugitive-slave clause as granting slaveholders an absolute right, unqualified by any state law, to recover an escaped enslaved person in whatever state that person was found, reasoning that any state rule delaying or limiting recovery amounted to a partial 'discharge' the clause forbade.
- Because the clause implied both a right of self-help recapture and a right to a formal 'claim' process, the Court concluded the Constitution itself contemplated a remedy beyond mere seizure, and that some government had to supply the mechanics of proof, certification, and safe transport.
- Applying the principle that where a constitutional duty exists, the power to carry it out is implied even without an express grant of legislative authority, the Court held Congress had power to pass the Fugitive Slave Act of 1793 to supply that missing remedy.
- The Court then asked whether this lawmaking power was exclusive to Congress or shared with the states, and concluded it must be exclusive because a patchwork of differing state rules on proof, timing, and procedure would make the guarantee unreliable and could effectively let anti-slavery states undermine it.
- Because the power to legislate remedies for the fugitive-slave clause belonged only to Congress, the Court held that Pennsylvania's 1826 law, which criminalized the same taking the Constitution protected, could not stand alongside it.
- The Court distinguished this exclusive federal power from the states' separate 'police power' to control disorder and vagrancy within their own borders, making clear that police-power justifications could not be stretched to cover regulation of fugitive-slave recaptures.
Doctrinal impact
Cases affected by this decision
Reaffirms Sturgis v. Crowninshield (4 Wheat. 122)
Relies on this earlier ruling's test for when a granted federal power is exclusive of state legislation.
Reaffirms Houston v. Moore (5 Wheat. 1)
Cites this case's rule that once Congress regulates a subject, states cannot supplement it with added rules.