Unions lobby the government to make them pass laws that make your work life more enjoyable even if you don't belong to one. This is needed to counter balance the lobbying power of the employers. For example, if fire breaks out at the place where you work, most probably you'll find fire extinguishers and emergency exits, and this fact is not due to your employer's benevolence or your professionality: your employer would be compelled by market forces to make you work in a dangerous place, if there weren't laws in place preventing malevolent employers from competing with him.
I'm not impoverished, despite you saying I should be without a union...
You don't need to be a communist to actually believe in the role of unions: the IMF, certainly not a lair of leftists, found out that inequality and poverty rise when the power of unions falls.