From the Pennasylvania Freeman:
Many of the readers of the Freeman are familiar with the case of Dr. Brooke, and others, of Ohio.
By the constitution and laws of that State, all slaves entering her territory with the consent of their owners, are declared free. A party of slaveholders emigrating from Virginia to Missouri with their human chattels, encamped for the night in Clinton county, in which reside a large number of active abolitionists.
Several of these called at the encampment, and informed the slaves that by the laws of the State they were in, they were entitled to their freedom; whereupon they all decamped. For this act, twenty-one persons were indicted for abduction and riot.