https://www.youtube.com/watch?v=VWImO1Qz4Zo

while it is in German and Swiss -Dialect - there are somewhere apparently english subtitles? -Crypto AG- what a company it must have been...
But what surprises me most, NOT ONCE it was mentioned, had they or did they, spy on the Soviet Union. It was mostly South America, the Middle East and Yugoslavia.
Surprisingly well presented. And believable?