Act for the relief of Indian Slaves and Prisoners
The Act for the relief of Indian Slaves and Prisoners, which was passed on March 7, 1852, in the Utah Territory, dealt with Native American slavery. A similar law, the Act in Relation to Service, which had made slavery legal in the territory, had been passed on February 4, 1852.
Source: Wikipedia — Act for the relief of Indian Slaves and Prisoners (CC BY-SA 4.0)