Anti-Mormonism is discrimination, persecution, hostility or prejudice directed against the Latter Day Saint movement, particularly The Church of Jesus Christ of Latter-day Saints (LDS Church). The term is often used to describe people or literature that are critical of their adherents, institutions, or beliefs, or physical attacks against specific Saints or the Latter Day Saint movement as a whole.
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Opposition to Mormonism began before the first Latter Day Saint church was established in 1830 and continues to the present day. The most vocal and strident opposition occurred during the 19th century, particularly the forceful expulsion from Missouri and Illinois in the 1830s and 1840s, during the Utah War of the 1850s, and in the second half of the century when the practice of polygamy in Utah Territory was widely considered by the U.S. Republican Party as one of the "twin relics of barbarism" along with slavery.
Modern-day opposition generally takes the form of websites, podcasts, videos or other media promoting negative or hateful views about Mormonism or protest at large Latter-day Saint gatherings such as the church's semiannual General Conference, outside of Latter-day Saint pageants, or at events surrounding the construction of new LDS temples. Opponents generally believe that the church's claims to divine origin are false, that it is non-Christian, or that it is a religion based on fraud or deceit on the part of its past and present leaders. The FBI began tracking anti-Mormon hate crimes in the United States in 2015 and have noted an increase in incidents over time.