The film, which is the second part of an ongoing historical series, covers the seminal labor-related events which occurred between the late 1800's and the 1920's. Its subtitle refers to a 1915 song composed by Ralph Chaplin as an anthem for unionized workers. The film itself is the cinematic version of that anthem, as it allows us a comprehensive understanding of the need for these early labor unions, and the enormous sacrifices of its members to ensure fairness, safety, and equality in the workplace..