James Warren Jones (May 13, 1931 – November 18, 1978) was an American cult leader, preacher and mass murderer who founded and led the Peoples Temple between 1955 and 1978. Jones and the members of his inner circle planned and orchestrated a mass murder–suicide which he described as “revolutionary suicide”, in his remote jungle commune at Jonestown, Guyana on November 18, 1978, including the assassination of U.S. congressman Leo Ryan. Jones and the events that occurred at Jonestown have had a defining influence on society's perception of cults. Wikipedia
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