Man Accused of Impersonating FBI Agent in Alleged Bid to Free Luigi Mangione

Getting your Trinity Audio player ready...

NEW YORK (BFMG) — A Minnesota man is accused of posing as an FBI agent and showing up at a New York City federal jail with bogus paperwork in a failed attempt to spring a high-profile inmate awaiting trial in the killing of UnitedHealthcare CEO Brian Thompson.

Mark Anderson, 36, of Mankato, Minnesota, was arrested Wednesday night and charged with impersonating a federal officer after he allegedly arrived at the Metropolitan Detention Center in Brooklyn claiming he had a court order to release inmate Luigi Mangione.

A criminal complaint filed in federal court does not name the inmate Anderson allegedly tried to free, but a law enforcement official familiar with the investigation confirmed it was Mangione. The official was not authorized to speak publicly and spoke on condition of anonymity.

Authorities say Anderson walked into the jail’s intake area around 6:50 p.m., told uniformed officers he was an FBI agent and said he had paperwork “signed by a judge” authorizing the release of a specific person in custody. When officers asked for his federal credentials, Anderson instead produced a Minnesota driver’s license and tossed multiple documents at them, according to the complaint.

Anderson also claimed to be armed, the complaint said. A search of his bag turned up a barbecue fork and a circular steel blade resembling a small pizza cutter, but no firearm.

The law enforcement official said Anderson had recently traveled from Mankato — about 67 miles southwest of Minneapolis — to New York, where he was working at a pizzeria after another job opportunity fell through.

Mangione, 27, is being held at the Metropolitan Detention Center while he awaits both state and federal murder trials in Thompson’s killing. Prosecutors allege Thompson, 50, was shot from behind on Dec. 4, 2024, as he walked to a midtown Manhattan hotel for UnitedHealth Group’s annual investor conference. Investigators have said the ammunition used in the attack was inscribed with the words “delay,” “deny” and “depose,” echoing a phrase critics use to describe how insurers avoid paying claims.

Mangione, an Ivy League graduate from a wealthy Maryland family, was arrested five days later at a McDonald’s in Altoona, Pennsylvania. After a series of court appearances there, he was transferred to New York and lodged at the Brooklyn lockup, a facility that has housed defendants ranging from former Venezuelan President Nicolás Maduro to hip-hop mogul Sean “Diddy” Combs and cryptocurrency executive Sam Bankman-Fried.

The attempted jailhouse ruse comes at a pivotal moment in Mangione’s legal odyssey. Just hours before Anderson’s arrest, the Manhattan district attorney’s office urged a state judge, Gregory Carro, to set a July 1 trial date in the state case. Mangione has pleaded not guilty and faces a possible life sentence if convicted.

On Friday, he is scheduled to appear in federal court for a conference before U.S. District Judge Margaret Garnett, who is expected to rule on whether prosecutors can seek the death penalty and whether certain evidence will be allowed at trial. Garnett has already scheduled jury selection in the federal case to begin Sept. 8, with the remainder of the trial to take place in October or January, depending on her death penalty ruling.

Mangione has become a cause célèbre among critics of the health insurance industry, drawing vocal supporters who attend his court hearings in green — a nod to the Luigi character from the Mario Bros. video games — and carry signs reading “Free Luigi” and “No Death For Luigi Mangione.”

Anderson is expected to make his initial appearance Thursday in Brooklyn federal court. Online court records did not list an attorney for him, and a message seeking comment was left with a spokesperson for Mangione’s legal team.

Copyright 2026 Blunt Force Media Group, LLC. All rights reserved. This material may not be published, broadcast, rewritten, or redistributed.

Share this article

TIPS AND INFORMATION REPORTING GUIDELINES

Blunt Force Media Group is committed to providing a safe and confidential platform for individuals to report tips and information related to criminal activities. To ensure the integrity and effectiveness of our tip submission process, we have established the following policy:

Confidentiality and Anonymity

Confidentiality 
We take the confidentiality of our tipsters seriously. Personal information provided will be kept confidential and will not be shared without explicit consent, except as required by law.

Anonymity
If you wish to remain anonymous, you may do so. Please be aware that maintaining complete anonymity may limit our ability to follow up for additional information or clarification.

Accuracy and Detail

Provide Specific Information
To assist in the investigation, please provide as much detailed and specific information as possible, including names, dates, locations, and descriptions of the criminal activity.

Supporting Evidence
If available, please include any supporting evidence, such as photographs, documents, or recordings. Ensure that any evidence submitted does not contain malware or other harmful software.

Legal Compliance

False Reporting
Submitting false information or intentionally misleading tips is a criminal offense and may be subject to legal action. We take the accuracy of the information seriously to protect the integrity of our investigations.

Mandatory Reporting
Certain types of information, such as those involving child abuse or imminent threats to safety, may require us to report to appropriate authorities as mandated by law

Submission Methods

Online Form
Tips can be submitted through our secure online form available on our website. Ensure all required fields are completed accurately.

Phone
Tips can also be submitted via our hotline for specific cases. When a hotline for a case is established, callers will speak to a live representative who will collect the information and submit it to the appropriate jurisdiction to investigate the lead. Calls are recorded for quality and verification purposes.

Mail
For those preferring traditional methods, tips cannot be mailed to our postal address and will not be accepted.

Follow-Up and Feedback

Acknowledgment
Upon submission, you will receive a reference number for your tip. Keep this number for any future correspondence regarding the tip.

Follow-Up
We may contact you for additional information if you have provided contact details. If you wish to remain anonymous, ensure your initial submission is as comprehensive as possible.

Feedback
While we cannot provide detailed feedback on ongoing investigations, we value your contribution and will do our best to acknowledge receipt and update you where appropriate.

Data Protection

Data Security
We employ robust security measures to protect the data submitted through our platform. All information is stored securely and accessed only by authorized personnel.

Retention Policy
Information provided will be retained for as long as necessary to fulfill the purposes outlined in this policy and comply with legal requirements.

Disclaimer

No Liability
Blunt Force Media Group is not liable for any consequences resulting from the submission of tips. By submitting information, you acknowledge that you have read, understood, and agree to this policy.

Contact Us

For any legal questions or concerns regarding this policy or others, please contact us at: Email: legal@bluntforcemedia.com