Colonel Hogan! He would know. They were involved in... well, Schultz called it "monkey business". Kommandant Klink called it "shenanigans", "tomfoolery", "fishy goings-on", or any like phrase he'd learned from the prisoners. Oskar called it "resistance work" and "the impossible". Because of course it's not a coincidence that Oskar Danzig and Karl Langenscheidt look exactly alike.