learned of the Boston Miracle. In the late 1990s, during a similar crisis, community leaders tried a new approach to dealing with the gang-related violence that was causing an epidemic of youth homicide. Using rigorous analysis to map group associations, a team of researchers joined with prosecutors, law enforcement, social service providers, and faith leaders to identify and contact the people most likely to kill or be victimized. The young men (nearly always men) were gathered, in person, for a “call-in.” Here, officials and community members would promise to concentrate all law enforcement
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