NYPD 's secret ##aries from first 50 years unveiled in book about the force . Looking at men who led the police , book covers kickbacks and brutality . deputy chief of police led the mob to the murder of his star recruit . Another continues to investigate criminal infiltration in the ranks of his department .
NYPD 's secret history from first 50 years unveiled in book about the force . Looking at men who led the police , book describes kickbacks and brutality . One chief of police led the mob to the whereabouts of his star detective . Another failed to investigate KKK infiltration in the ranks of his department .