The rise of the American labor movement was characterized by bloody and revolutionary battles. From the first famous martyrs, the Molly Maguires in the Pennsylvania coal fields in the nineteenth century, to the crucial workers' victory of the 1930s in the sit-down strikes against General Motors, it has a history of pitched battles that frequently erupted into open warfare.

This is also the story of the factional wars within the American labor movement itself and of the great leaders it generated: Eugene Debs, Samuel Gompers, William Z. Foster, Bill Haywood, John L. Lewis, Walter...