One of the oldest law enforcement agencies in the country, dating over 130 years, DOI is a unique office charged with the task of rooting out and preventing municipal corruption within the City of New York.  Often considered the City's "watchdog," DOI has had to re-define itself many times in order to combat the ever-changing forms of corruption.

Learn more about DOI's history by clicking on the timeline links below:
The Early Years: 1873 - 1933
DOI as Watchdog: 1934-1977
Reorganization and Whistleblowers: 1978 - 1999
Getting the Worms Out of the Big Apple: 2000 - present

Harper's Weekly dated November 25, 1871,
announcing the end of Tammany Hall corruption.
(Click on image to view full size.)