#OTD 1927, more than 10,000 coal miners in Colorado struck under leadership of Industrial Workers of the World. The IWW organized an elected general strike committee comprising representatives of the ethnic and racial groups among strikers, including Mexican, black, Anglo, Italian, Slavic, and Greek miners. Strikers faced massive repression, culminating in the Columbine Mine Massacre of November 21, when state police fired on 500 picketer, killing six men and injuring at least 20 more strikers. Despite the repression, the strike was a success: even though the workers did not gain all their demands, they obtained a wage increase and ended the strike through a vote in January instead of being smashed. The Communist Party and the International Labor Defense built solidarity with the strike among workers throughout the country, including organizing a protest outside the Standard Oil headquarters in Lower Manhattan after the massacre in November, highlighting the Rockefellers’ role in the Colorado coal industry.