Good for them. I work for a large company and am a member of the union. While they're not perfect they're very constructive and provide a lot of benefits to all employees, and also to the company itself. Compensation has become very complex over the years. While most people understand their pay the rest is usually where employers cheap out, things like insurance, sick pay, long-term provider care, pension contributio…
Some are, some the opposite. Often people discuss unions like something very homogenous. They're like companies - there will be both loan sharks and non-profit activists (and lots in between).
I hope it all turns out well for googlers.