I strongly recommend reading this article on CIA propaganda aimed at its own employees:
Greg Miller and Adam Goldman January 31 , 2016. ‘Eyewash’: How the CIA deceives its own workforce about operations. The Washington Post, https://www.washingtonpost.com/world/national-security/eyewash-how-the-cia-deceives-its-own-workforce-about-operations/2016/01/31/c00f5a78-c53d-11e5-9693-933a4d31bcc8_story.html?wpmm=1&wpisrc=nl_headlines
Senior CIA officials have for years intentionally deceived parts of the agency workforce by transmitting internal memos that contain false information about operations and sources overseas, according to current and former U.S. officials who said the practice is known by the term “eyewash.”
Agency veterans described the tactic as an infrequent but important security measure, a means of protecting vital secrets by inserting fake communications into routine cable traffic while using separate channels to convey accurate information to cleared recipients.
But others cited a significant potential for abuse. Beyond the internal distrust implied by the practice, officials said there is no clear mechanism for labeling eyewash cables or distinguishing them from legitimate records being examined by the CIA’s inspector general, turned over to Congress or declassified for historians....
Not surprising really. What is surprising is that its being reported in The Washington Post.
Here are some links to previous posts on propaganda: