This book studies the changing ways in which American industrial workers mobilised concerted action in their own interests between the abolition of slavery and the end of open immigration from Europe and Asia. Sustained class conflict between 1916 and 1922 reshaped governmental and business policies, but left labour largely unorganised and in retreat. The House of Labor, so arduously erected by working-class activists during the preceeding generation, did not collapse, but ossified, so that when labour activism was reinvigorated after 1933, the movement split in two. These developments are analysed here in ways which stress the links between migration, neighbourhood life, racial subjugation, business reform, the state, and the daily experience of work itself.