One of the first general strikes in the United States, the 1877 St. Louis general strike grew out of the Great Railroad Strike of 1877. The general strike was largely organized by the Knights of Labor and the Marxist-leaning Workingmen's Party, the main radical political party of the era. When the railroad strike reached East St. Louis, Illinois in July 1877, the St. Louis Workingman's Party led a group of approximately 500 people across the river in an act of solidarity with the nearly 1,000 workers on strike.