See:
https://en.wikipedia.org/wiki/History_of_union_busting_in_th...
"By August 29 battle was fully joined. Chafin's men, though outnumbered, had the advantage of higher positions and better weaponry. Private planes were hired to drop homemade bombs on the miners. A combination of poison gas and explosive bombs left over from World War I were dropped in several locations near the towns of Jeffery, Sharples and Blair." https://en.wikipedia.org/wiki/Battle_of_Blair_Mountain
Someone else in the thread mentioned a revived push for "company towns", which is exactly what these workers were fighting against. Being fired from their company meant losing their job and their house, since it was owned by the company. Honestly, it's not much different from being fired in 2021 and losing your job and your health insurance.
No idea if it has any relation to the original Pinkerton strike-breakers, but using that name is pretty callous given its history.
What's more is that it isn't some sort of ironic twist of circumstances, it's just that there aren't a lot of organizations you can call for that kind of work at scale.