In a prologue, the relationship between capital and labor throughout history is shown in caveman days, Biblical times, and the feudal period. In the main story John Stoddard, a construction chief building a gigantic bridge for capitalist Courtlandt Van Nest, sympathizes with the workers' dissatisfaction with low salaries and subsistence conditions. When his attempts to negotiate with Van Nest fail, the workers, led by agitator Lavinsky, prepare to strike. Van Nest's daughter Janet, who is engaged to a militia captain, visits the site and is appalled by the squalor. Despite their differences, Janet and Stoddard fall in love. When the strike breaks, Van Nest sends in the militia. As they prepare to fire, Stoddard sees Lavinsky about to throw dynamite, and wrestles it away. He then agrees to Van Nest's demand for settling the strike that he refrain from seeing Janet.