I read in the WaPo piece I linked that Hill was convicted and hanged in Utah. Given the little history of Utah I have read (in Jon Krakauer’s Under the Banner of Heaven) Utah was very much a lawless place.
I have only read one history of the IWW. When my wife and I were young, we belonged to a Puerto Rico History (and literature and social science) reading group for about 10 years. There, we read about the Galician labor organizer, Santiago Iglesias Pantin, who arrived in PR and eventually founded the original PR Socialist Party (not the current one which is Stalinist and Cuba oriented).
There are Puerto Rico historians who lament that Iglesias was prevailed upon by (I think) Samuel Gompers and thus did not affiliate with the IWW, but with the AFL-CIO (I think). They say this changed the course of the Puerto Rican labor movement in the early XXth Century from a more radical focus to a wage centric focus.
I generally refuse to look stuff up if I feel sure about my memory. And usually, for baseball history and PR history I read 20-30 years ago, it is pretty accurate. Anyway, I need to read about PA labor history or US labor history in general for a phase. I have been stuck reading about the South and its pernicious influence on American political history and discourse. And when I take a break from that, these days, I usually read Latin American history or fiction. But next time I go to the Queens Library I will look for and maybe order something if they have nothing in our branch on PA and American Labor history.