"And cursed shall be the seed of him that mixeth with their (the Lamanites) seed; for they shall be cursed even with the same cursing. And the Lord spake it, and it was done."
-- II Nephi 5:23
This verse from the Book of Mormon was stolen right of the White supremacists' playbook. No mixing. Do not associate with people of color.
Even though the Book of Mormon was written over 150 years ago, the Mormons still hold fast to the core belief of no mixing. Last year, the Brandon Davies scandal kept the BYU basketball team from making the Final Four in 2011. Here's the real reason why he was suspended.