Understanding our fascination with the criminal underworld. Jia Zhangke’s takes an empathetic look at criminal brotherhoods in China in his new gangster film “Ash Is Purest White.” Stand-up comics reveal what it was like working in Vegas when mobsters owned the clubs. A brave critic defends “The Godfather: Part III.” And how the late Sue Grafton created the seedy universe of her “Alphabet” crime novels.

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