"Ms. Epperlein conducts her inquiry armed with a giant, fuzz-covered microphone and adorned with a pair of heavy black headphones. This equipment looks a bit comical, but its presence is as much a declaration of ethical principles as an arresting visual joke. The Stasi took pictures and made recordings in secret; its surveillance was stealthy, invisible. Ms. Epperlein — who with her cropped blond hair and regal bearing resembles Robin Wright in “House of Cards” — becomes a walking emblem of honesty and transparency, an embodiment of the documentary ideal." Mocking Karl Marx in the US. How brave.