"30,000 Locked Out: The Great Chicago Construction Union Strike" is a book written by James C. Bix that reveals one of the most important historical events in American industry. The book details the strike that took place in Chicago and brought together 30,000 construction workers. The author unfolds step by step the events and conflicts that led to this strike and the consequences it had for workers, commercial construction projects, and the city of Chicago as a whole. This book invites the reader to feel the atmosphere of the time, to understand the motivations of workers and employers, and to explore the social and economic aspects of this significant conflict.