Have you been scammed or do you know someone who has been scammed? Did you send $500 to someone by Western Union or Moneygram only to have him disappear? Did you try to help out a prince or widow who was thrown out in a coup and has a billion
Here is a list of resources you can use in order to bring the scammer to justice.
Federal Trade Commission (FTC)
Phone: 1-877-FTC-HELP (1-877-382-4357)
Online complaint form: https://www.ftccomplaintassistant.gov/FTC_Wizard.aspx?Lang=en
Email them and send copies of your transactions (including emails with headers). Send a CC to firstname.lastname@example.org if it is a Nigerian scam email.
FBI/Internet Crime Complaint Center
Phone: (800) 221-4424
Online complaint form: http://www.ic3.gov/complaint/default.aspx
FTC - Identity theft
More information: http://www.ftc.gov/bcp/edu/microsites/idtheft/consumers/defend.html
National Fraud Information Center/Internet Fraud Watch
Report form: https://secure.nclforms.org/nficweb/nfic.htm
Contact Local Police and let them know of the whole story, however embarrassing it may be.