In a bizarre incident, Mark Anderson, a 36-year-old man from Minnesota, was arrested and charged with impersonating an FBI agent after he allegedly attempted to secure the release of Luigi Mangione, the accused killer of United Healthcare CEO Brian Thompson, from a federal detention center in Brooklyn, New York. The event unfolded on Wednesday, with Anderson claiming to have court orders and weapons, only to be detained after prison staff grew suspicious.
On Wednesday, Anderson arrived at the Metropolitan Detention Center in Brooklyn and presented himself as an FBI agent, according to federal complaints. He told officers that he possessed paperwork signed by a judge authorizing the release of an inmate, later identified by law enforcement sources as Luigi Mangione. When asked for credentials, Anderson provided a Minnesota driver’s license and claimed to be armed, prompting further scrutiny from Bureau of Prisons personnel.
During the encounter, Anderson reportedly displayed and threw numerous documents at jail staff, which appeared to be related to filing claims against the U.S. Department of Justice. A search of his backpack revealed unusual items, including a barbecue fork and a tool resembling a pizza cutter. Authorities said Anderson had traveled to New York from Mankato, Minnesota, for a job opportunity that fell through, and he had been working at a local pizzeria prior to the incident.
Anderson was formally charged on Thursday with impersonating a federal officer and appeared before a magistrate judge, who ordered him detained as a flight risk. A spokesperson for the U.S. Attorney’s Office for the Eastern District of New York confirmed the detention, and Anderson’s court-appointed federal public defender has not yet commented on the case.
Luigi Mangione, 27, has been held at the Brooklyn jail since December 2024 after his arrest in Pennsylvania following a multi-state manhunt. He faces both state and federal charges for the ambush killing of United Healthcare CEO Brian Thompson in midtown Manhattan in 2024. Mangione has pleaded not guilty to all charges, including second-degree murder and federal counts of stalking and firearm-related murder.
In April 2025, Attorney General Pam Bondi announced that the government would seek the death penalty for Mangione, describing the killing as an act of political violence and a premeditated assassination. Federal prosecutors have argued that Mangione poses a threat to public safety by potentially inspiring others to use violence for ideological ends, citing his growing support base.
Since his arrest, Mangione has attracted a significant following, with his legal defense fund raising over a million dollars from supporters who decry high healthcare costs in the U.S. His case has sparked national debates about healthcare affordability and the use of violence in political discourse, making him a folk hero to some while remaining a defendant in a serious criminal trial.
Looking ahead, jury selection for Mangione’s federal trial is scheduled for September 2026, while Anderson’s case for impersonation will proceed through the courts. The incident underscores the heightened tensions surrounding high-profile cases and the lengths to which individuals might go, highlighting ongoing challenges in the justice system and public discourse.
