It’s difficult to know what’s happened here because we don’t know how many of the employees were trying to organize. Not enough information in this article to determine what really happened. Can’t just assume that because employees were generally happy in the early 90s that they are feeling the same way today. From what it sounds like, a significant number of current employees seem interested in organizing; otherwise, the union would not be trying to force a contract.
And why are union dues supposed to be bad, but profits, which are taken from workers or consumers, are good?