[citation needed] By 1843, several hundred enslaved people a year escaped to the North successfully, making slavery an unstable institution in the border states.After 1840, the Black population of Cass County, Michigan proliferated as families were attracted by White defiance of discriminatory laws, by numerous highly supportive Quakers, and by low-priced land.Since a suspected enslaved person was not eligible for a trial, the law resulted in the kidnapping and conscription of free Blacks into slavery, as purported fugitive slaves had no rights in court and could not defend themselves against accusations.[10] According to abolitionist John Brown, even in the supposedly safe refuge of Springfield, Massachusetts, "some of them are so alarmed that they tell me that they cannot sleep on account of either them or their wives and children.Webster sought to enforce a law that was extremely unpopular in the Northern United States, and his Whig Party passed him over again when they chose a presidential nominee in 1852.This law rendered the federal Fugitive Slave Act effectively unenforceable in Vermont and caused a storm of controversy nationally.No test events took place in Vermont, but the rhetoric of this flare-up echoed South Carolina's 1832 nullification crisis and Thomas Jefferson's 1798 Kentucky Resolutions.The Fugitive Slave Law brought the issue home to anti-slavery citizens in the North, as it made them and their institutions responsible for enforcing slavery.[20]Several years before, in the Jerry Rescue, Syracuse abolitionists freed by force a fugitive slave who was to be sent back to the South and successfully smuggled him to Canada.[22] Other famous examples include Shadrach Minkins in 1851 and Lucy Bagby in 1861, whose forcible return has been cited by historians as important and "allegorical".[24] In Pittsburgh, for example, during the September following the passage of the law, organized groups of escaped slaves, armed and sworn to "die rather than be taken back into slavery", set out for Canada, with more than 200 men leaving by the end of the month.[31] Lincoln allowed Butler to continue his policy but countermanded broader directives issued by other Union commanders that freed all enslaved people in places under their control.[30] In August 1861, the U.S. Congress enacted the Confiscation Act of 1861, which barred enslavers from re-enslaving captured fugitives who were forced to aid or abet the insurrection.
Print by E. W. Clay, an artist who published many proslavery cartoons, supports the Fugitive Slave Act of 1850. In the cartoon, a Southerner mocks a Northerner who claims his goods, several bolts of fabric, have been stolen. "They are fugitives from you, are they?" asks the slaver. Adopting the rhetoric of abolitionists, he continues, "As to the law of the land, I have a higher law of my own, and possession is nine points in the law."
The Vicksburg Whig
did not cite any sources for these claims about the number of fugitives from American slavery ("Slaves Escaping from the South", January 16, 1861)
James Hamlet, the first man re-enslaved under the Fugitive Slave Law of 1850, in front of New York City Hall. The banner on the right reads: "A day, an hour, of virtuous liberty is worth an age of servitude".