The Organisms involved
When and where did the IWW and American Legion organize?
The IWW organized in Chicago 1905 and the American Legion organized in March 15-17 1919.
How many people went up to the Wobbly's Hall?"
Two or three people went up to the hall.
How long had the tension been growing before the Massacre?
We don't know the exact number of months but we know it was several.