The Wisconsin Supreme Court ruled that the Fugitive Slave Act of 1850 was unconstitutional for requiring states to go against their own laws in protecting slavery. Ableman v. Booth was appealed by the federal government to the US Supreme Court, which upheld the constitutionality of the Act.he Fugitive Slave Act of 1850, part of the Compromise of 1850, was a law enacted by the Congress that declared that all fugitive slaves should be returned to their masters. Because the South agreed to have California enter as a free state, The Fugitive Slave Act of 1850 was created.