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Buried secrets: The Osage murders

| In the early 20th century, an oil rush in the Osage Nation, located in a corner of Oklahoma, produced a torrent of oil revenues for the Native American tribe, making them the richest people per capita in the world - "the Kuwaitis of the 1920s," one writer observed. But their wealth invited greed, exploitation and murder on the part of white "guardians" who came to control the Osage's money, and would lead to the first major investigation by the FBI. David Grann, author of the bestseller "The Lost City of Z," talks with correspondent Lee Cowan about the Osage Reign of Terror, as recounted in his new book, "Killers of the Flower Moon."