Parsons was described by the Chicago Police Department as "more dangerous than a thousand rioters."
Canadian workers joined the union a year after it was formed, at which point it came to be called the International Union of Steam Engineers.
It burned for three days, killing 200-300 people, destroying 17,450 buildings, leaving 100,000 homeless and causing damages worth an estimated $200 million in 1871 dollars.
A five-man Central Executive Council was established, dues were set, and the official motto became "Schedule with Safety."
It was the largest labor union of its time and one of the first industrial unions in the United States.
A group of determined Chicago workers who captured the attention of a nation three years ago when they took over their plant.
The Hyatt hotel chain seems determined to continue an attack on housekeepers that it began more than a year ago when it fired veteran employees in Boston and replaced them with lower paid temporary workers.
Wisconsin's union busting governor Scott Walker came to Chicago last week and labor, community and Occupy Chicago reminded him the Windy City is a union town.
Occupy Chicago protesters adopted two official demands: Repeal the Bush tax cuts for the rich and prosecute "Wall Street Criminals."
Sixty workers who have been on strike at Chicago's Congress Hotel for eight years were joined June 15 by hundreds of supporters at a rally outside the hotel.