Charlie Chaplin use ("Easy Street", 1917). He often explored these topics ironically, making comedy out of suffering. Social commentary was a feature of Chaplin's films from early in his career, as he portrayed the underdog in a sympathetic light and highlighted the difficulties of the poor. Later, as he developed a keen interest in economics and felt obliged to publicise his views, Chaplin began incorporating overtly political messages into his films. "Modern Times" (1936) depicted factory workers in dismal conditions, "The Great Dictator" (1940) parodied Adolf Hitler and Benito Mussolini and ended in a speech against nationalism, "Monsieur Verdoux" (1947) criticised war
Charlie Chaplin over the making of his pictures. "A Dog's Life", released April 1918, was the first film under the new contract. In it, Chaplin demonstrated his increasing concern with story construction and his treatment of the Tramp as "a sort of Pierrot". The film was described by Louis Delluc as "cinema's first total work of art". Chaplin then embarked on the Third Liberty Bond campaign, touring the United States for one month to raise money for the Allies of the First World War. He also produced a short propaganda film at his own expense, donated to the government for fund-raising, called