Art Young was one of the most renowned and incendiary political cartoonists in the first half of the 20th century. And far more -- an illustrator for magazines such as The Saturday Evening Post and Colliers, a magazine publisher, a New York State Senatorial candidate on the Socialist ticket, and perhaps the only cartoonist to be tried under the Espionage Act for sedition. He made his reputation appearing in The Masses on a regular basis using lyrical,...