MS-13 Gang Member who Led Transnational Fentanyl Distribution Operation from Inside State Prison Sentenced to 17 Years by South Florida Federal Judge

MIAMI – A district judge in Ft. Lauderdale, Fla. has sentenced an MS-13 gang member and leader of a transnational drug trafficking organization (DTO) to 210 months in federal prison for running a fentanyl distribution ring, some of which he did from inside a state prison.

Mario Clifford Rivera (a/k/a “Chuky”), 32, is a member of MS-13, a designated foreign terrorist organization. From at least 2022, Rivera used the U.S. Postal Service to distribute fentanyl smuggled into the United States from Mexico. The fentanyl’s travel path: over the wall from Mexico to California, then to Florida by mail for distribution by Rivera and the DTO dealers he controlled.  

In early 2023, while free on bond waiting to report to state prison to serve three years for felon in possession of a firearm, throwing a deadly missile into an occupied vehicle, and aggravated assault crimes, Rivera offered to sell two kilograms of fentanyl to a buyer in Florida, some of which was purchased. Once inside state prison, Rivera continued managing and supervising his DTO. He used prison phones and a contraband cell phone to communicate with his dealers on the outside. Rivera directed them on how to sell fentanyl and what prices to charge, all while making sure that he received his share of the drug proceeds.

Rivera was responsible in this case for distributing over three kilograms of fentanyl. He pled guilty to drug trafficking charges and will begin serving his federal sentence once he completes his state sentence.   

“Rivera’s 17-year federal prison sentence should serve as a warning to MS-13 and other terrorist gangs who seek to flood our communities with deadly poisons like fentanyl: Whether you operate on the streets or behind prison walls, we will identify your leaders and members, dismantle your networks, and hold you accountable using the full force of American law,” said U.S. Attorney Hayden O’Byrne for the Southern District of Florida.   

Assistant U.S. Attorney Rinku Tribuiani for the Southern District of Florida prosecuted this case.

FBI Miami; U.S. Postal Inspection Service Miami Division; DEA Miami Field Division; Homeland Security Investigations (HSI) Miami Field Division, and Palm Beach County Sheriff’s Office investigated it. 

“The safety of South Florida communities is our top priority,” said acting Special Agent in Charge Brett Skiles of FBI Miami. “Shutting down drug trafficking networks like Rivera's is a key step towards achieving this priority. Our long-standing partnerships with USPIS Miami, DEA Miami, HSI Miami and the Palm Beach County Sheriff's office were crucial to this successful investigation. Let this case serve as a warning to MS-13 and other gangs who terrorize communities with violence and sow misery through drug trafficking: these activities will not be tolerated.”

“The U.S. Postal Inspection Service is committed to ensuring the U.S. Mail is not used as a tool to distribute dangerous drugs, like fentanyl, to our communities, said Miami Division acting Inspector in Charge Steven L. Hodges. “The sentence handed down should serve as a reminder that we remain steadfast with our law enforcement partners to bring those who engage in drug trafficking through the mail to justice.”

“We and our law enforcement partners will continue to pursue and arrest those who flood our communities with illicit, dangerous, and highly-addictive drugs,” said DEA Miami Field Division Special Agent in Charge Deanne L. Reuter. “It is our top priority to protect our citizens and get these gang members off our streets.”

“Homeland Security Investigations and our law enforcement partners have a clear message: those who traffic deadly narcotics and endanger our communities through gang violence will face the full force of justice,” said acting Special Agent in Charge Jose Figueroa of HSI Miami Field Division. “HSI remains relentless in dismantling transnational criminal organizations like MS-13 and stopping the flow of fentanyl that continues to devastate families across our nation.”

This case is part of Operation Take Back America, a nationwide initiative that marshals the full resources of the Department of Justice to repel the invasion of illegal immigration, achieve the total elimination of cartels and transnational criminal organizations (TCOs), and protect our communities from the perpetrators of violent crime. Operation Take Back America streamlines efforts and resources from the Department’s Organized Crime Drug Enforcement Task Forces (OCDETFs) and Project Safe Neighborhood (PSN).

It is also part of an OCDETF operation. OCDETF identifies, disrupts, and dismantles the highest-level criminal organizations that threaten the United States using a prosecutor-led, intelligence-driven, multi-agency approach. Additional information about the OCDETF Program can be found at https://www.justice.gov/ocdetf.

You may find a copy of this press release (and any updates) on the website of the United States Attorney’s Office for the Southern District of Florida at https://www.justice.gov/usao-sdfl.

Related court documents and information may be found on the website of the District Court for the Southern District of Florida at www.flsd.uscourts.gov or at http://pacer.flsd.uscourts.gov under case number 24-cr-80140.

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