As the mayor of New York City, Rudy Giuliani was a proponent of a controversial policing philosophy known as "broken windows." It calls for police to go after small crimes, in hopes of preventing bigger problems.
At first, it appeared as if violent crime dropped in the neighborhoods where "broken windows" policing was in force. The statistics, however, told a different story.
But the idea remains popular, despite evidence it likely had only modest effects.
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