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US crime rates show a steady rise in violent crime throughout the 1960s and ’70s, peaking in 1980. Taxi Driver came out in February 1976; the bleak and violent film was hailed as an encapsulation of its time, to no one’s surprise. Many retired cops I talk to, from Sacramento but other places too, uniformly recall 1968 to 1980 as a particularly grim period.
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Michelle McNamara (I'll Be Gone in the Dark: One Woman's Obsessive Search for the Golden State Killer)