The NYPD Tapes
Fantastic piece on the Voice's investigation about cops jiggering crime stats by refusing to make crime reports, or calling serious crimes minor ones, then going after the whistleblower who made their doings public. Graham Rayman writes in the Village Voice:

For more than two years, Adrian Schoolcraft secretly recorded every roll call at the 81st Precinct in Brooklyn and captured his superiors urging police officers to do two things in order to manipulate the "stats" that the department is under pressure to produce: Officers were told to arrest people who were doing little more than standing on the street, but they were also encouraged to disregard actual victims of serious crimes who wanted to file reports.

Arresting bystanders made it look like the department was efficient, while artificially reducing the amount of serious crime made the commander look good.

In October 2009, Schoolcraft met with NYPD investigators for three hours and detailed more than a dozen cases of crime reports being manipulated in the district. Three weeks after that meeting--which was supposed to have been kept secret from Schoolcraft's superiors--his precinct commander and a deputy chief ordered Schoolcraft to be dragged from his apartment and forced into the Jamaica Hospital psychiatric ward for six days.

...Investigators went beyond Schoolcraft's specific claims and found many other instances in the 81st Precinct where crime reports were missing, had been misclassified, altered, rejected, or not even entered into the computer system that tracks crime reports.

These weren't minor incidents. The victims included a Chinese-food delivery man robbed and beaten bloody, a man robbed at gunpoint, a cab driver robbed at gunpoint, a woman assaulted and beaten black and blue, a woman beaten by her spouse, and a woman burgled by men who forced their way into her apartment.

...•In a 2009 incident, an elderly man said he was a burglary victim. When he showed up at the precinct to file a report, a sergeant told him to go to another precinct to file. Again, this is a violation of the NYPD's own policy. It was only after a newspaper article appeared months later that a report was taken.

•A 60-year-old retired traffic agent made repeated visits to the precinct to get a complaint number for her stolen vehicle from May through June 2009. The investigation showed the report was never entered into the NYPD computer system, preventing it from being counted in the crime statistics. Investigators concluded nothing would have been done if the woman hadn't been a former traffic agent and pressed the issue.