CHICAGO (AP) — Several owners of bulk-mailing businesses in Illinois are accused of pocketing millions by charging companies for 80 million pieces of mail and never actually paying the U.S. Postal Service.

A Monday statement from the U.S. attorney’s office in Chicago says the scheme by three men between 2010 and 2015 cost the Postal Service at least $16 million. It allegedly involved forging signatures and using an official Postal Service stamp to make it appear the postage had been paid.

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Those charged are 58-year-old Yogesh Patel, from Orlando, Florida; 57-year-old Arvind Lakkamsani, of Northbrook; and 51-year-old David Gargano, of Barrington. Each is charged with mail fraud and, if convicted, could face maximum sentences of 20 years in prison.

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Reached Monday evening, attorneys for all three men declined comment.

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