Photo of the Victor Union Hall after the shooting, from the Rastall book.
Here are more historic photos of the Victor union hall.
The New York Times wrote a newspaper account of events in 1904, when the union was driven out.
There is a comprehensive overview of the Colorado Labor Wars on Wikipedia:
Harry Orchard assassinated former Idaho Governor Frank Steunenberg. A Steunenberg descendant maintains a blog about the history, the impact on the family, and other relevant information: