History of Germany. Poster with the phrase "The enemy listens!". Encouraging people to be vigilant because of the presence of enemy spies.

20 XX TWENTIETH CENTURY • 20TH CENTURY • 20TH • APARTMENT • BUSY • CABANA • CAPITAL • CARTEL • CLOTHES • COMMUNISM: POLAND • CONTEMPORARY AGE • CONTEMPORARY PERIOD • COTTAGE • COUCH • COUNTRY HOUSE • CUSTODY • DIVAN • DRESS • DRESSED • DWELLING • DWELLINGS • EAVESDROPPING • ENCOURAGING • ENEMIES • ENEMY LISTENS!, THE • ENEMY LISTENS • ENEMY • EUROPA • EUROPE • EUROPEA • EUROPEAN • EUROPEANS • FLOOR • FURNITURE • GARMENT • GERMAN • GERMANS • GERMANY • GLASSES • GOWN • GROUP • GUARD • HABITATION • HAT • HAT    • HEADGEAR • HISTORIA UNIVERSAL • HISTORIA • HISTORY • HOME • HOUSE • HOUSES • HOUSESIGN • HOUSING • HUMANS • HUT • INDOOR • INSIDE VIEW • INSIDE • INTERIOR • KEEP AN EYE ON • LODGE • MALES • MAN MEN • MAN • MEN • MODERN • MODERNIZATION • MODERNIZE • NATIONAL SOCIALISM • NAZI • NAZISM • PEOPLE • PHRASE • PINCE-NEZ • PIPE • PLACARD • POLAND • POLAND: COMMUNISM • POLAND: POSTWAR • POLE • POLISH • POSTER • POSTWAR: POLAND • PRESENCE • RECONSTRUCT • RECONSTRUCTION • REPLICA • SENTENCE • SHOPSIGN • SIGN (INFORMATION) • SIGNS • SILESIA • SMOKE • SMOKER • SMOKING • SOCIETY • SOFA • SPIES • SPY • SPYING • SUN • SUNSHINE • SURVEILLANCE • TABLE • TÉLÉ • TELEVISION (MEDIA) • TELEVISION SET = TV SET = TELLY • TELEVISION SET • TELEVISION • TELLY • TRANSPARENT • TV SET • TV • TWENTIETH CENTURY • TYPICAL • UPPER SILESIA • VIGILANCE • VIGILANT • WATCH