The United States has never had a shortage of cults based on religious teachings and charismatic leaders, but perhaps none are as infamous as Jim Jones and the Peoples Temple, which remain notorious for the mass murder-suicide event in Jonestown, Guyana on November 18, 1978, during which nearly 900 people drank cyanide-laced Flavor Aid, including nearly 300 children. To this day, “drinking the Kool-Aid” is a popular phrase in America to refer to people who blindly follow a person or idea without thought, and the event at Jonestown was the deadliest deliberate act involving Americans in history until the 9/11 attacks. In addition to those deaths, Peoples Temple members also murdered a handful of others on the same day, including journalists, a member trying to leave Jonestown, and Congressman Leo Ryan.

David Koresh, the leader of the Branch Davidians, had deep convictions based on the Book of Daniel and the Book of Revelation, and his sect believed the world was in the power of Satan and that the nations were merging to form a new Babylon. David hoped to establish the kingdom in Jerusalem, where, according to him, he would suffer martyrdom. The headquarters of the sect was a complex called Mount Carmel Center located in Waco, Texas. Koresh claimed to be the mysterious Lamb of Revelation who opens the sealed scroll, as well as the figure who rides the White Horse when the first seal is opened.

On paper, the extraordinarily unorthodox ideology spouted by Heaven's Gate ranks near the top of the list of most outlandish end-of-the-world prophecies, and it was built on a blend of Christian, Gnostic, supernatural, New Age, and extraterrestrial lore. Although the cult did not speak in Christian terms, it was clearly apocalyptic, and its belief system was a strange mix between science fiction and the basic message of Revelation.