Here is a good source to learn more:
https://www.educate-yourself.org/tg/
The Ted Gunderson Files
Franklin Roosevelt knew of the Pearl Harbor at least attack 6 weeks before it happened. I had first hand telephone conversations with retired Navy officer Duane Whitlock before he passed away in which he told me that he was part of the Navy decoding team that deciphered the Japanese code in the late..
https://www.educate-yourself.org/tg/