Bodies lie around the compound of the People's Temple in Jonestown, Guyana, on November 18, 1978. More than 900 members of the cult, led by the Rev. Jim Jones, died from cyanide poisoning; it was the largest mass-suicide in modern history. See the story of Jonestown in the "Crimes and Cults" episode of " The Seventies ," July 9 at 9 p.m ET/PT. David Hume Kennerly/Getty Images

A portrait shows Jim Jones, the founder of the People's Temple, and his wife, Marceline Jones, seated in front of their adopted children and next to his sister-in-law, right, with her three chilldren. Jones relocated the People's Temple from San Francisco to Guyana. Don Hogan Charles/New York Times Co./Getty Images

Children of People's Temple members are tended to in the nursery of the sect in 1978, in Georgetown. (It was renamed Jonestown after the sect's leader). AFP/Getty Images

Members mend old clothes in a house in Jonestown. AFP/Getty Images

The airplane that carried U.S. Rep. Leo Ryan of California sits on a runway November 18, 1978 in Port Kaituma, Guyana after Ryan was shot and killed by members the cult. Ryan was boarding the plane after paying an investigative visit to the cult's compound. The visit and subsequent assassination precipitated the mass suicide. David Hume Kennerly/Getty Images

People's Temple follower Larry Layton, center, stands with police following his arrest in connection with the shooting at the remote Guyana airstrip. Layton was convicted in 1986 by a federal jury in San Francisco of conspiring in Ryan's murder and aiding and abetting in the attempted murder of Richard Dwyer, a U.S. diplomat wounded in the attack. David Hume Kennerly/Getty Images

Bodies lie in a room near a tub of cyanide-laced punch. David Hume Kennerly/Getty Images

The compound of the People's Temple cult. David Hume Kennerly/Getty Images

Children also were forced to drink the poison. Frank Johnston/The Washington Post/Getty Images

Closeups of bottles of cyanide. Matthew Naythons/Time & Life Pictures/Getty Images

Investigators examine the People's Temple compound. David Hume Kennerly/Getty Images

Inside the People's Temple in Jonestown. More than 900 Americans died in a murder-and-suicide ritual at the People's Temple agricultural mission. The Washington Post/Getty Images

U.S. military personnel remove bags containing bodies of members of the cult on November 23, 1978. AFP/Getty Images

An unidentified man straps a stack of aluminum coffins for shipment to the United States. Neal Boenzi/New York Times Co./Getty Images