Thompson, 54, was one of three men charged with conspiring to traffic marijuana to St. Thomas between July 2016 and March 2017, alongside Calvin Benjamin and Stephen Bernier.
Benjamin and Bernier pleaded guilty to conspiracy to distribute and possession with intent to distribute marijuana in late 2017, and were each sentenced to serve 37 months behind bars.
At trial, Benjamin testified about how Thompson used his position as a postal worker to ensure it was safe for him to pick up parcels containing marijuana, and prosecutors said 28 packages were identified over the course of the conspiracy.
Evidence tied Thompson to distribution of approximately 102 kilograms, or nearly 225 pounds of marijuana, according to a sentencing memorandum filed Wednesday by Assistant U.S. Attorneys Kyle Payne and Yasir Sadat.