Washington — A man was arrested on Wednesday for allegedly impersonating an FBI agent and trying to free Luigi Mangione from the Brooklyn jail where he is being held, according to federal court filings and a law enforcement source. The source added that Anderson had traveled to New York for a job opportunity that did not work out and has been working in a pizzeria. Anderson is 36 years old and from Mankato, Minnesota, the source said. When asked for his credentials, Anderson “displayed his Minnesota Driver’s license to the [Bureau of Prisons] officers and then claimed to be in possession of weapons,” according to the affidavit. Anderson “also displayed and threw at the BOP officers numerous documents” related to filing claims against the Department of Justice, the affidavit said.