During the first half of this century, Allis-Chalmers was Wisconsin's largest employer. The firm hired a variety of workers, including the native-born, immigrants, the skilled, the unskilled, and eventually women and a small number of blacks. Stephen Meyer presents a history of the Allis-Chalmers workers, and of the growth and destruction of the militant, left-wing union they built. The story of these workers and their union serves as a microcosm of the history of American labor in the twentieth century. Meyer describes how skilled workers, fearful of mechanization, worked to develop a robust union in the 1930s. He details the battle for unionization among the more militant CIO, the conservative AFL, Communists, and Allis-Chalmers management officials. Meyer tells us about several of the key players in this battle--Harold Story, the Allis-Chalmers vice president and chief labor strategist, and Harold Christoffel, the electrical worker who became the powerful first president of the union. Meyer also analyzes the technical and social transition from batch to mass production, the social and cultural world of the ordinary workers at the workplace, and the factional struggles on the shop floor and picket line. He concludes by examining the CIO's entry into Wisconsin politics, the subsequent campaign against union leftists, the rise of Joseph McCarthy, the consolidation of Walter Reuther's position as UAW president, and the passage of the Taft-Hartley law.