"Behind the Badge: The US Postal Inspection Service."

Front page of the Evening World of October 25, 1921,
reflecting the largest robbery of the time

The new exhibition "Behind the Badge: The U.S. Postal Inspection Service" at the Smithsonian's National Postal Museum includes famous scammers such as Charles Ponzi, a forged Robert Frost poem, counterfeit stamps, mail heists, assaults and murders of postal employees, and other cases involving the service such as that of the Unabomber.