Did you see the documentary, "Citizen Four"?
If you like the subject matter (I do), you would like another doc that Laura Poitras --director of Citizenfour, who was played by Melissa Leo in Snowden-- also directed called The Program. It's the story of real life higher-up in the NSA, William "Bill" Binney, who designed the program that the NSA (and doubtless others) use to spy on American citizens. When Binney realized what the agency was using it for, he resigned, and started to undermine the NSA and other Fed agencies who treat the public as suspects and enemies.
~Doc