The “Apache” actress and activist wasn’t Native American, say her sisters. And that wasn’t the only thing she lied about. You might not know her name, but you’ve probably seen the video that made her famous. In 1973, actress and activist Sacheen Littlefeather took the stage at the Oscars dressed in a beaded buckskin dress in place of Marlon Brando, after he was awarded Best Actor for his role as Vito Corleone in “The Godfather.” Claiming Apache heritage, she spoke eloquently, to a backdrop of boos, of the mistreatment of Native Americans by the film industry and beyond. The...