Here, some quotes by Brigham Young about race.
"You see some classes of the human family that are black, uncouth, uncomely, disagreeable and low in their habits, wild, and seemingly deprived of nearly all the blessings of the intelligence that is generally bestowed upon mankind . . . Cain slew his brother. Cain might have been killed, and that would have put a termination to that line of human beings. This was not to be, and the Lord put a mark upon him, which is the flat nose and black skin." (Journal of Discourses, vol. 7, p. 290).
"In our first settlement in Missouri, it was said by our enemies that we intended to tamper with the slaves, not that we had any idea of the kind, for such a thing never entered our minds. We knew that the children of Ham were to be the "servant of servants," and no power under heaven could hinder it, so long as the Lord would permit them to welter under the curse and those were known to be our religious views concerning them." (Journal of Discourses, vol. 2, p. 172).
"Shall I tell you the law of God in regard to the African race? If the white man who belongs to the chosen seed mixes his blood with the seed of Cain, the penalty, under the law of God, is death on the spot. This will always be so." (Journal of Discourses, vol. 10, p. 110).