It's not fair to say that Marcel Ophüls "interviews" his subjects. He disarms them, then let's them tell their story, quite often a very ugly story, that they'd never admit to without a few glasses of wine in them. Marcel understands that this is one of those stories you'll only hear out of the mouths of the actual players. From Prime Ministers to farmers to German officers, everyone gets the treatment. With a handful of exceptions, the story is one of willful collaboration, and... is it really fair to call shipping Jews to death camps "antisemitism"? Let's just say that all families have their secrets, and France's collective secret is that they embraced the Nazi's with vigor.
Question: What does Marcel Ophls do to his subjects?, Answer: Interviews Question: What beverage helps tell the stories?, Answer: Wine Question: What is France's collective secret?, Answer: That they embraced the Nazis