Thanks for telling me that. It's a topic we have covered a lot in #DecipherYou because it comes up time and time again as so many documents reference and support it.
Here's a short clip from one of the episodes about it:
Here's some of the reporting I did on the same topic back in my analysis of Batch 2: https://decipheryou.com/2016/12/02/analysing-snowdens-sidtoday-files-part-two/ (ctrl-F CIA to find it)
Which references this document just as one example: https://theintercept.com/snowden-sidtoday/3008272-a-graduate-s-view-of-the-icslp-class/
Hope that helps. If you have a look through the DecipherYou episodes I've posted on my Steemit blog, there are timestamped sections for each and that will show more examples too.
Thanks for your time and interest!