Who Were Margaret Morgan and Edward Prigg?

Margaret Morgan was born into slavery in Maryland and had been living with her husband and their children in the free state of Pennsylvania for five years when hired slavecatchers led by Edward Prigg seized them one night in 1837

Margaret Morgan was born into slavery in Maryland and had been living with her husband and their children in the free state of Pennsylvania for five years when hired slavecatchers led by Edward Prigg seized them one night in 1837