Federal prosecutors say a Tennessee man has been sentenced to life in prison for distributing large amounts of methamphetamine.

The U.S. attorney’s office in Jackson, Tennessee, said in a news release Tuesday that 58-year-old Rolando Lopez and several other co-defendants trafficked meth, heroin, marijuana and other illegal drugs from Mexico to Tennessee. Prosecutors argued that it was the largest drug trafficking organization known to have been prosecuted within the Western District of Tennessee.

Investigators said Lopez and others converted liquid methamphetamine into powder form. Prosecutors said the drug ring distributed thousands of pounds of meth in west Tennessee.