The battle of Blair mountain was an uprising of 10k+ coal miners for better working conditions in 1921. The result was the national guard coming in to kill a bunch of Americans.
(Side note: they wore red bandanas around their neck. Although the term redneck was used prior to this battle, some claim the red bandana as an alternate history for the word. redneck origin/definition )
In addition to the coal wars in the east, there was the Colorado coal war and the ludlow massacre Also some really nasty stuff at the Carnegie steel works in Pittsburgh perpetrated by HC Frick while Carnegie himself turned a blind eye.
The labor movement is specifically and deliberately ignored by ALL public schools in the US
Labor laws, like no child labor, the weekend, 8 hour day- they are written in the blood of fallen workers, the blood of their children and wives.