According to the host of "Turner Classic Movies", this movie is based on F.B.I. files. I also learned that the theatrical release of "Confessions of a Nazi Spy" almost resulted an international incident that might have caused America's premature entrance into World War II, two years before the 1941 Japanese attack on Pearl Harbor. I've seen documentaries about the activities of the German-American Bundt and can tell you that this movie has the frightening ring of authenticity. Well worth seeing if you can't get a hold of documentaries on the subject.
