Under the Banner of Heaven is a great book. Also check out American Massacre by Sally Denton. For some online info on MMM and Blood Atonement (which is why Utah had the firing squad so long), check out these links.
The more you know about Mormonism, the scarier it is.
http://1857massacre.com/
http://utlm.org/topicalindexb.htm#Mountain%20Meadows%20Massacre
http://utlm.org/topicalindexa.htm#Blood%20Atonement
Interestingly, we had a troll here on FR named “neodanite”. To those who know LDS history, the Danites were the LDS hit squad. He got zotted in short order.
I just started a few weeks ago. The more I look, the more I see westernized islam.
I will not cast a vote for an LDS. Ever.