It's a commie holiday.
Unions have their place, certainly the miners needed one. The way it used to work was they would pay these immigrants just enough so they were perpetually in debt, the company owned the town, the store and everything else so they would make sure the cost of living could not be met. Practically slaves as they really had no choice. worked 10 or 12 hours a day 6 days a week. Working conditions were deplorable and men frequently died.
The trouble with unions today is many of them have gotten greedy, workers have gotten lazy because they know they can't be fired and many other problems like corruption and political agendas. The union itself is no longer solely looking out for the interests of the workers that need it, especially those that really need it because their wages will never bring enough cash to their coffers to justify organizing them.