According to Chile’s Department of Labor, employers can not require employees that typically work Monday to Friday (or Saturday) to work on May 1st.
This official holiday starts at 9:00 pm the night before and ends at 6:00 am on May 2nd.
Chilean President Carlos Ibáñez del Campo signed the law that declared May 1st an official Chilean holiday in 1931.
Most public places close down on May 1st so if you are traveling in Chile during that time, plan for a lack of options and even a shortage of public transportation.
May 1st will also bring out protesters that may even spill into riots. If you see any of this activity, stay clear and go the opposite direction.