Robert Redford as Dan Rather and Cate Blanchett as Mary Mapes in “Truth.” Photo: Sony

Mary Mapes won a Peabody Award for producing a television story about torture at Abu Ghraib. She may be best known, though, for a different story that led to her dismissal from CBS. This week, we talk about “Truth,” a new movie that follows how the story was put together and the outrage that followed.

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