Der Unhold / The Ogre - by Volker Schlöndorff (1996)

Frenchman Abel Tiffauges likes children, and wants to protect them against the grown-ups. Falsely suspected as child molester, he's recruited as a soldier in the 2nd World War, but very soon he is taken prisoner of war. After shortly serving in Goerings hunting lodge, he becomes the dogsbody in Kaltenborn Castle, an elite training camp for German boys. Completely happy to take care of these children, he becomes a servant of Nazism, catching boys from the area as supplies for the camp.