For anyone who enjoyed this article: there is another excellent CIA report about Czechoslovkian counterintelligence intercepting Hungarian mail in the 1930s[1].

For anyone who enjoyed this article: there is another excellent CIA report about Czechoslovkian counterintelligence intercepting Hungarian mail in the 1930s[1]. That article was posted on HN about a year ago[2]. [1]https://www.cia.gov/library/center-for-the-study-of-intelligence/kent-csi/vol2no4/html/v02i4a11p_0001.htm https://www.cia.gov/library/center-for-the-study-of-intellig... [2]https://news.ycombinator.com/item?id=21384393 https://news.ycombinator.com/item?id=21384393