George Grosz was a German artist known especially for his savagely caricatural drawings of Berlin life in the 1920s. He was a prominent member of the Berlin Dada and New Objectivity group during the Weimar Republic before he emigrated to the United States in 1933.
The bourgeoisie and the petty bourgeoisie have armed themselves against the rising proletariat with, among other things, "culture." It's an old ploy of the bourgeoisie. They keep a standing "art" to defend their collapsing culture.