Illegal Alien Pleads Guilty to Selling Firearm and Fentanyl to Undercover Law Enforcement

BOSTON - An illegal alien from the Dominican Republic, who is an associate of the D Street Projects gang in the South Boston area, pleaded guilty yesterday in federal court in Boston to selling a firearm and fentanyl to an undercover law enforcement agent.

Junior Martinez-Perello, 27, pleaded guilty to one count of possession with intent to distribute, and distribution of, fentanyl. U.S. District Court Judge Myong J. Joun scheduled sentencing for Jan. 6, 2027. In July 2025, Martinez-Perello was arrested and charged.

In May 2025, Martinez-Perello communicated with undercover law enforcement about selling 100 grams of fentanyl and a firearm. On May 30, 2025, Martinez-Perello agreed to meet in Boston for a drug and gun deal. Martinez-Perello informed the undercover agent that he would always have firearms available and not to be concerned about purchasing firearms from him, and that he would be able to obtain and distribute half-kilogram quantities of fentanyl in the near future.

During the controlled purchase, Martinez-Perello explained how the safety feature worked on the firearm. At one point during the sale, Martinez-Perello pointed the loaded firearm towards the ground, manipulated the firearm in a fashion that was consistent with rendering the firearm safe and attempting to remove the live ammunition from the firearm. During this process, Martinez-Perello disengaged the safety mechanism on the firearm and fired one round into the floor.

The charge of possession with intent to distribute, and distribution of, fentanyl provides for a sentence of up to 20 years in prison, at least three years and up to a lifetime of supervised release and a fine of up to $1 million. Sentences are imposed by a federal district court judge based upon the U.S. Sentencing Guidelines and statutes which govern the determination of a sentence in a criminal case.

United States Attorney Leah B. Foley and Thomas Greco, Special Agent in Charge of the Bureau of Alcohol, Tobacco, Firearms & Explosives, Boston Field Division made the announcement today. Assistant U.S. Attorney John T. Dawley of the Organized Crime & Gang Unit is prosecuting the case.

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 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 and Project Safe Neighborhood.