A British WWII propaganda short warning citizens that Nazi sympathizers could be listening to their everyday conversations to discover important information about the war effort. A British WWII propaganda short warning citizens that Nazi sympathizers could be listening to their everyday conversations to discover important information about the war effort. A British WWII propaganda short warning citizens that Nazi sympathizers could be listening to their everyday conversations to discover important information about the war effort. A British WWII propaganda short warning citizens that Nazi sympathizers could be listening to their everyday conversations to discover important information about the war effort.