Vincenzo Cannalire, Francesco Galdelli and Vanja Goffi were charged with fraud, forgery and possession of stolen goods after launching their GC Exclusive clothing line in 2008.
Clooney testified against the trio when the case went to trial last July (10), insisting he'd never even met the men.
He told the court, ""I came here because I believe in the judicial system and because there were people using my name to take advantage of people.""
The defendants even went as far as to forge the Ocean's Eleven actor's signature on business documents for their GC Exclusive clothing line and doctor photos appearing to show Clooney with the men.
On Wednesday (11May11), a jury in Milan found the trio guilty in the first degree of fraudulently using Clooney's identity to sell their clothing.
Goffi was sentenced to three years and 10 months behind bars, while Galdelli was handed three years and six months, and Cannalire was ordered to serve one year and 10 months in jail.