I have had some people request my source for the story regarding Bishop Snow and the young man he castrated due to disobedience. The account appears in a book written by John D. Lee who was part of the Mountain Meadow Massacre and was a good friend to Joseph Smith and part of the leadership of the church. He was also an alleged member of the Danites. The Danites were a group of men who were the enforcers of the laws. They would protect the leaders of the church and quietly take out those who opposed them. Many acts of Blood Atonement in the early church were also attributed to the Danites. There are different historical views on the extent of the actions of the Danites but none deny that they did in fact exist.
The full text of his book is available on-line by clicking the link below. This story is found on page 284-286.
Confessions of John D. Lee, Photo-reprint of 1877 edition