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Wikimedia Foundation refuses voluntary union recognition, hires union-busting law firm
(en.wikipedia.org)
This is a most excellent place for technology news and articles.
From reading the article and watching the video, it didn't sound like they were refusing the option of having a union. It was more that they wanted to have an official vote on the matter, and didn't want to be pressured into a decision on the spot:
If workers want to unionize, that's their business. Workers don't need anyone's permission to organize. Unionization means conditions are bad and individual efforts to correct them have failed. The company wanting an "official vote" is just an excuse to add friction to a process that requires none.