No, I strongly support unions. People have a right to gather and demand their labor be compensated fairly. Don't see how that's related to taxation though.

As for flat taxes - they are a scam that hurt low and middle wage earners much more than rich people. A progressive taxation system is the most fair implementation of taxation - where people that have little means pay less and people with lots of means pay more. This equalizes the relative impact taxation has on the individual's income to be much fairer than any flat tax every could be. A 20% tax on a 30k/y income is much harder to bear for the individual than a 50% taxation on a 3m/y income. Someone with 24k to spend after taxes will have a much harder time to make ends meet than someone with a 1.5m take-home income.