A man falsely claiming to be an FBI agent showed up to a federal jail in New York on Wednesday night and told officers he had a court order to release Luigi Mangione, authorities said. A criminal complaint filed against Anderson did not identify the person he attempted to free. AdvertisementAnderson is expected to make an initial appearance on Thursday in Brooklyn federal court. Online court records did not contain information on a lawyer who could speak on his behalf. Luigi Mangione appears in Manhattan Supreme Court in December.