A man falsely claiming to be an FBI agent showed up to a federal jail in New York City on Wednesday night and told officers he had a court order to release Luigi Mangione, authorities said. WATCH HERE WATCH HEREA criminal complaint filed against Anderson did not identify the person he attempted to free. Anderson was expected to make an initial appearance Thursday in Brooklyn federal court. The attempt to free Mangione happened during a critical stretch in his legal cases. Accused killer Luigi Mangione, facing charges in the murder of UnitedHealthcare CEO Brian Thompson was back in court Tuesday.