If you want to read an incredible book about the CIA working with the nazis, definitely get a copy of The Devil's Chessboard by David Talbot. It's a phenomenal read dealing largely with CIA director Allen Dulles and his collaboration with the Nazis when he was stationed in Bern Switzerland during WWII. Very highly recommended!
https://www.goodreads.com/book/show/24723229-the-devil-s-chessboard
Marked it to grab it, will try to get time to read it asap. It's really sad to still find people defending the CIA and NATO as being some forces for good despite all the harm they have done around the world and all the lies they spread.