In the late nineteenth and early twentieth centuries, coal mining was the most important industry in Colorado. Coal mines served as the crucibles of empire, churning out the fuel needed to power the railroads, precious-metal mines, and smelters that…

The Denver Tramway Strike of 1920 typified the active militancy of many labor unions during the early 1900s. The strike brought the conversation surrounding labor relations to the forefront of Denver politics and would influence the larger labor…