1st. May Workers Day
May 1, 2016
May 1st. was chosen to be the International Workers' Day in order to commemorate the events that happened on May 4, 1886 at Haymarket in Chicago. The police tried to disperse a public meeting during a general strike demanding for eight-hour workday, when an unidentified person threw a bomb at police. The Police responded by firing on the workers, killing four protesters.
This day is celebrated in many countries either today or tomorrow.