FBI Internet Crime Complaint Center (IC3)
The IC3 is the central hub for you to report cyber-enabled crime. It is run by the Federal Bureau of Investigation, the lead federal agency for investigating crime.
When combined with other data, the information you report allows the FBI to investigate reported crimes, track trends and threats, and, sometimes, freeze stolen funds. IC3 shares reports of crime throughout its network of FBI field offices and law enforcement partners, strengthening collective response both locally and nationally.
Site: https://www.ic3.gov/