CHICAGO (REUTERS).- The horrors and heroism of World War Two are given a fresh look in an Art Institute of Chicago exhibition of rediscovered Soviet propaganda posters, which depict Hitler as blood-thirsty, anxious and perverse. One poster in the “Windows on the War” exhibition, opening to the public on Sunday, features a caricature of a worried Hitler hiding a crude hand gesture under his cap while Joseph Goebbels orates nervously. Another poster produced by Moscow’s TASS studios depicts a fearsome, wolf-like Nazi drooling as Allied bombs fall; and another depicts heroic partisans blowing up a Nazi supply train and firing at escaping soldiers. “Despite the tyranny of Stalin, creativity flourished” in the former