May Day was marked once again around the globe with political protests and demonstrations by organized labor. The Occupy Wall Street movement, which formed last year in New York, used the day to spread its message of social and economic inequality. Also known as International Workers Day, May 1 is marked in different ways around the world, and in many countries May Day is observed as a national holiday. This celebration of the international labor movement stemmed from a deadly 1886 labor demonstration in Chicago calling for an eight-hour workday. -- Lloyd Young( 39 photos total