Two Jamaican nationals will be in prison for at least three years for helping run an international money laundering organization that washed over $6 million in drug trafficking proceeds from Colombian cartels, in part through Massachusetts banks.

Federal Judge Richard G. Stearns has sentenced Dennis Raymond Rowe, 60, to 52 months in prison and St. Devon Anthony Cover, 61, to 42 months for their involvement in the “sophisticated” network. Both are subject to deportation upon completion.

A federal grand jury had indicted Rowe and Cover, along with 18 other individuals from Colombia, Jamaica and Florida, in May 2022 in connection with the money laundering conspiracy.

Stearns issued the sentences on Wednesday.

Law enforcement began looking into the organization, primarily located in Barranquilla, Colombia, in or about October 2016.

The investigation lasted five years, authorities said in a release on Thursday.

Investigators found that the group laundered over $6 million in drug proceeds through intermediary banks in the United States, including those in the Bay State, and additional money through banks in the Caribbean and Europe through the Colombian Black Market Peso Exchange.

“By using the BMPE, the defendants and their co-conspirators sought to conceal drug trafficking activity and proceeds from law enforcement as well as evade currency exchange requirements in the United States and Colombia through the illegal currency exchange process,” the release states.

“As part of the conspiracy,” it adds, “members of the organization held roles and responsibilities relative to the needs and opportunities of the scheme, such as drug suppliers, peso brokers, money couriers and business owners/dollar purchasers.”

Investigators discovered $1 million seized from corporate bank accounts while tracing nearly 3,000 kilograms of cocaine that had a street value of over $90 million back to the organization.

The cocaine haul included 1,193 kilograms seized at sea 60 miles south of Jamaica in July 2019 and 1,555 kilograms recovered in nine scrap metal shipping containers at the Port of Buenaventura, Colombia, in March 2019.

Rowe is said to have laundered over $600,000, and Cover washed roughly $268,000, by delivering bulk cash drug proceeds to undercover law enforcement.