The FBI also requested and received help from MI5, particularly on investigating the false claims that Chaplin had not been born in England but in France or Eastern Europe, and that his real name was Israel Thornstein.
FBI juga meminta dan meraih bantuan dari MI5, tertuama untuk menyelidiki klaim-klaim palsu bahwa Chaplin tidak lahir di Inggris namun di Prancis atau Eropa Timur, dan bahwa nama aslinya adalah Israel Thornstein.