Director: Laura Poitras. This is a documentary about Edward Snowden, the whistle-blower who exposed the widespread surveillance of the online activity of millions of citizens. The film raises the question of the limits of the power the state does or should exercise over citizens. If one has the fear that everything one does or says is being observed, it obviously puts limits on discussion, which is a limitation on freedom and democracy. Extremely terse and gripping as a spy thriller, this is a necessary watch for the sake of things one needs to be aware of, if not paranoid about.