DOI works with a variety of law enforcement agencies and prosecutors. Those entities can be found at the following links:

New York City Police Department:
http://www.nyc.gov/html/nypd/html/home/home.shtml

Federal Bureau of Investigation:
http://newyork.fbi.gov/

New York State Attorney General:
http://www.oag.state.ny.us/

United States Attorney's Office Eastern District of New York:
http://www.usdoj.gov/usao/nye/

United States Attorney's Office Southern District of New York:
http://www.usdoj.gov/usao/nys/

District Attorneys:

http://www.brooklynda.org/
http://www.bronxda.net/
http://www.manhattanda.org/index.shtml
http://www.queensda.org/
http://rcda.nyc.gov/

New York City Civilian Complaint Review Board:
http://www.nyc.gov/html/ccrb/

Conflicts of Interest Board of the City of New York:
http://www.nyc.gov/html/conflicts/html/home/home.shtml