The Battle of Blair Mountain in Logan County, West Virginia, happened in 1921. Bobby Kennedy called it “the Gettysburg of the union movement.”
The Battle of Blair Mountain was one of the biggest civil uprisings in the United States history and the largest armed insurrection since the American Civil War. For five days in late August and early September 1921, in Logan County, West Virginia, between 10,000 and 15,000 coal miners confronted an army of police and strikebreakers backed by coal operators during a struggle by the miners to unionize the southwestern West Virginia coalfields. Their struggle ended only after approximately one million rounds were fired, and the United States Army intervened by presidential order. (From Wikipedia).
Watch this short video to understand why the struggle is not over: