Prigg v. Pennsylvania was a landmark Supreme Court case decided in 1842 that ruled on the constitutionality of state laws concerning the return of fugitive slaves. The Court found that the federal Fugitive Slave Act of 1793 superseded state laws, which allowed for the capture and return of enslaved individuals who escaped to free states. This case significantly reinforced the legal codification of slavery by prioritizing federal authority over state legislation regarding the treatment of fugitive slaves.