The Colorado National Guard and guards from the Rockefeller-owned ,Colorado Fuel and Iron Company, attacked a tent colony of striking miners on April 20, 1914, who were demanding better wages, safety, and union recognition at Ludlow, Colorado. After a 14 hour battle killed 20 to 25 people, including 2 women and 11 children.
The massacre led to a "Ten-Day War" of revenge attacks by miners across the region, which ended only when President Woodrow Wilson ordered federal troops to intervene.The strike failed, the outcry against the "Ludlow Massacre" helped fuel the labor movement and led to long-term labor reforms. The United Mine Workers of America (UMWA) erected a monument to the victims at the site, which was dedicated in 1918. More