International Workers' Day is the commemoration of the 1886 Haymarket affair in Chicago. The police were trying to disperse a public assembly during a general strike for the eight hour workday, when an unidentified person threw a bomb at them. The police reacted by firing on the workers, killing four demonstrators.
World workers' day also known as May Day is celebrated every year on 1st May, in Tanzania the festival is held at national level, it brings together workers from different sectors private and public institution.
