How Nazis involved in Amelia Earhart's disappearance?

Your best source of info about Earhart is a group called TIGHAR, which is, I think, at tighar.org . I don't think Nazis had anything to do with it. She seems to have been a rookie at using radio, even shipped her vital telegraph key home "to save weight". Her radio had been modified, which undoubtedly lowered its range. When radio contact with Itasca became her only real hope of finding them, she simply couldn't make good contact.