The Federal Trade Commission’s official identity theft website (www.ftc.gov/idtheft) is "a one-stop national resource to learn about the crime of identity theft."
This crime can have disastrous financial and legal consequences for its victims if not detected and dealt with in a timely manner.
It’s well-worth nothing here that in addition to being the de facto definitive source on this subject, the FTC is a non-profit government agency.
(They’re not trying to sell you anything.)
Not only will you learn how to recognize and prevent identity theft (straight from the horse’s mouth so to speak) but the FTC also tells you what you can do to respond to and recover from identity theft (such as instigating a credit freeze).
Victims (or possible victims) of identity theft can also file an official complaint here.