Lily Gladstone and Leonardo DiCaprio star in ‘Killers of the Flower Moon.’ Photo: Melinda Sue Gordon/Associated PressThree years ago, Oklahoma teacher Debra Thoreson requested copies of a book about the century-old murders of Osage people that took place about an hour from where her school is now. But she changed her plan to assign the book, “Killers of the Flower Moon: The Osage Murders and the Birth of the FBI,” to her high school English students after passage of a state law that she feared could endanger her license and her school’s accreditation.

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Persons: Lily Gladstone, Leonardo DiCaprio, Melinda Sue Gordon, Debra Thoreson, ” Organizations: Associated Press, Osage, FBI Locations: Oklahoma