Today is Labor Day, the first Monday in September, the day President Grover Cleveland declared a national holiday in 1894. The Knights of Labor and the Central Labor Union organized the first labor parade in New York City in 1887 prior to the national holiday. There had been efforts before to commemorate May 1st as a national holiday to celebrate American workers, but the tragic outcome of the Haymarket Massacre in 1886 made that date too volatile and controversial. On Tuesday, May 4, 1886 a peaceful rally by workers striking in support of an eight-hour workday was disrupted by a dynamite bomb thrown at police officers as they attempted to disperse the demonstrators. Seven police officers, four civilians and dozens of protesters and bystanders were injured. Again in 1894, following the Pullman Strike in Chicago with the death of workers by the U.S. Military and U.S. Marshals, Congress rushed legislation to make Labor Day in September a national holiday, a tribute to American workers.