Guyana is revisiting a dark history nearly half a century after U.S. Rev. Jim Jones and more than 900 of his followers died in the rural interior of the South American country. It was the largest suicide-murder in history, and a government-backed tour operator wants to open the former commune now shrouded by lush vegetation to visitors, a proposal that is reopening old wounds, with critics saying it would disrespect victims and dig up a sordid past.