What issues did Frank Serpico deal with in the New York City Police department which had not been confronted effectively in its long history?

What issues did Frank Serpico deal with in the New York City Police department which had not been confronted effectively in its long history? Did his valiant efforts to reform the department meet with acceptance from the police brass? Were the changes in departmental regulations instituted by the Knapp Commission – ones that were inspired by Serpico's allegations – ever really adhered to by rank – and – file cops?

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