Watch on 123Movies. "Klein, a German Case" - The inside story on international terrorism related by an ex-terrorist Hans Joachim Klein. Through interviews, archive footage and reconstitution that clarify certain events, Klein reveals the workings of international terrorism : the underground networks, his participation in the OPEC bombing in Vienna, training camps, the manipulating role played by certain governments and the cynicism of those underground shadows that terrorized the world for 20 years.