In resistance to the Fugitive Slave Act the state of Wisconsin enacted a Personal Liberty Law that said they were not going to enforce the Fugitive Slave Act and turn in fugitive slaves, and the justification was that it was their state's right to do so.

为了抵制逃亡奴隶法,威斯康辛州政府颁布了个人自由法,规定他们不会执行,逃亡奴隶法并交出逃奴,理由是,该怎么做是他们州的权利

耶鲁公开课 - 美国内战与重建课程节选