Shows like Under the Banner of Heaven

focuses on two brothers who murdered the wife and infant daughter of their younger brother. The killers claimed they were acting on orders from God, consistent with their interpretation of a fundamentalist interpretation that goes back to the formation of Mormonism. The brothers were members of a splinter group called the School of Prophets, which adhered to original tenets of the faith that included polygamy and a belief that true believers could speak directly with God. These were rooted as the faith grew to a mainstream appeal, but the brothers remain convinced they were obeying God's command when they committed the heinous crime.