Feindberührung
Two ex-friends from East Germany meet up after many years. One was a dissident, the other spied on him for the Stasi. One went to prison. One did not. A unsettling story of how a dictatorship spun so strong it could completely control its population.
Starring
Watch "Feindberührung" on Amazon released in 2010. It's a documentary and history movie, and has a rating of 7.8 out of 10 from Imdb which is usually fine for this kind of movie, and is currently only available for purchase or rent.