Another religious group, the Church of Jesus Christ of Latter-Day Saints, or Mormons, was founded by Joseph Smith in 1830. Smith based his thinking on the Book of Mormon which traced a connection between American Indians and the lost tribes of Israel. Smith was murdered by a local mob in Illinois. To escape persecution, Mormons migrated to the far western frontier, where they established the New Zion on the banks of the Great Salt Lake in Utah. Their cooperative social organization helped the Mormons to prosper in their wilderness. However, their practice of polygamy aroused the hostility of the U.S Government.