The advent of new technologies in the early decades of the twentieth century changed the face of American farming. Increased mechanization and the expansion of markets demanded a new kind of agricultural worker - gone was the local farmhand, replaced by a cheap and temporary labor force of migrant and seasonal workers. In Harvest Wobblies, Greg Hall describes how members of the Industrial Workers of the World (IWW) organized the men, women, and children who had become so essential and yet so exploited on the farms of the American West.