That’s what it looks like on the surface, but this is not how unions (are supposed to) operate, at least not that I’ve ever seen.
There would have to be a significant number of employees who are in favor or union representation. Note that the article states, “The Gerawans and their workers have been resisting the union power grab.” [italics mine] But if the workers were truly opposed to union representation, the union would not be doing this. The article does not state the percentage of workers who are opposed to organizing. Even the signatures gathered to oppose the union represent only ~20% of the employees. What about the others? Maybe the 20% are old-time employees who have different pay/benefits than the newer employees, or maybe they’ve been bribed or threatened by their employer to oppose the union. That’s why I’m saying that we do not know enough about this story.
Of course, if I have it wrong, and the majority of the employees really do NOT want union representation, then I would agree that the union is operating in a corrupt and unethical way.