Honoré-Victorin Daumier was a French painter, sculptor, and printmaker, whose many works offer commentary on the social and political life in France, from the Revolution of 1830 to the fall of the second Napoleonic Empire in 1870. He earned a living producing caricatures and cartoons in newspapers and periodicals such as La Caricature and Le Charivari, for which he became well known in his lifetime and is still remembered today. He was a republican democrat (working class liberal), who satirized and lampooned the monarchy, politicians, the judiciary, lawyers, the bourgeoisie, as well as his countrymen and human nature in general.
This guy preceded the Impressionists and Modern Art historically, but I've always felt he was at least a couple of decades ahead of his time, him and JMW Turner should be regarded as modern artists.