John Heartfield (1891–1968), born Helmut Herzfel, turned art into a political weapon. Joining the KPD (German Communist Party) between WWI and WWII as well as following the Dadaists, he created photomontages mocking Hitler and the Nazi party. See more below.
1939. Hitler sharpening his knife to kill the French cockerel. The French foreign minister Bonnet says, “Don’t worry, Hitler is a vegetarian.” This image mocks the deluded ideas of appeasement by the French, who were Hitler’s sitting ducks. Hitler was in fact a vegetarian, which itself is creepy as he valued the lives of animals but mercilessly slaughtered people. Hitler had no sense of humor and put many comedians in concentration camps. Heartfield would have ended in a concentration camp or more likely with a bullet but he escaped to Czechoslovakia and later to England.