It's a shame to have to write a bad review about this title. It's actually some great information if you do not know much about the history of whistleblowers who I think are some of our greatest patriots, people who step up at the expense of their own well being in service of others and the US Constitution. That said, I'm not sure what else I could recommend that provides as wide of an overview as this film does. Certainly watching Citizenfour about Snowden is a fantastic start, and certainly The Most Dangerous Man in America: Daniel Ellsberg and the Panama Papers is top notch as well.
So, my main complaint is this film, which I stopped watching after close to 20 minutes, continually jumps between different stories and events with whistleblowers, apparently to make this seem more like a movie/film than the documentary it should be. Completely ridiculous for two particular reasons: 1 often one does not even know they've jumped to another topic, which takes place at a different time in history, place, and people...simply absured... 2 - even if one recognized the film has jumped or returned to another story, one is left trying to review (while also trying to pay attention to the film) what was said previously, say 5 minutes ago, and after listening to 5 minutes of other events. What a shame. Still a good film for a broad overview if you know nothing about whistleblower. Other than complicated direction, all stories are quite riveting when weighed against our democracy.