History of the New York City Police Department
The New York City Police Department (NYPD) originates in the Government of New York City attempts to control rising crime in early- to mid-19th-century New York City. The City's reforms created a full-time professional police force modeled upon London's Metropolitan Police, itself only formed in 1829.
Source: Wikipedia — History of the New York City Police Department (CC BY-SA 4.0)