John W. Gunnison reports that slavery is recognized "by custom" in Utah.
John Gunnison, The Mormons (New York: John W. Lovell Company, 1852), 143
Involuntary labor by negroes is recognised by custom ; those holding slaves, keep them as part of their family, as they would wives, without any law on the subject. Negro caste springs naturally from their doctrine of blacks being ineligible to the priesthood.