The U.S. Postal Inspection Service is the federal law enforcement extension of the U.S. Postal Service and investigates cases of identity theft. Sometimes an identity thief steals mail or changes your mailing address and uses it to get your personal and financial information, open new accounts, or commit tax fraud. If you think this has happened to you report it to your local postal inspector. Find the nearest office at https://postalinspectors.uspis.gov.