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Why is Labor Day not on May 1?

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Labor Day is not held on May 1 (May Day) because of the latterā€™s socialist origins and its association with various workersā€™ riots, notably Chicagoā€™s Haymarket Affair of 1886. U.S. officials instead selected Labor Day to honor workers, and on June 28, 1894, Pres. Grover Cleveland signed legislation making it an official federal holiday.