A man was arrested on Wednesday for allegedly impersonating an FBI agent and trying to free Luigi Mangione, according to federal court filings and a law enforcement source.

A Minnesota man was arrested and charged with impersonating an FBI agent after he tried to enter a federal jail and release suspected murderer Luigi Mangione, according to law enforcement sources.

Authorities say a man claiming to be an FBI agent showed up to a federal jail in New York City and told officers he had a ...