Mountain Meadow Massacre by Mark Twain

The Mormon church has worked hard and put in a lot of hours with apologists to try to avoid responsibility for this event. I found out about this event in my late twenties and the knowledge of this event was as pivotal in my leaving the church as their other racist doctrine, such as not allowing African American or African "Blacks" their priesthood, but Polynesian "Blacks" were justified.

Mormon Racism: African Americans and Africans

1970's video on why the LDS church would not let Africans or African Americans hold their priesthood. This was one of the first doctrines of the church I did not agree with as an eight-year old child.