> I can give you examples of rich countries that have lots of unions.
Just curious, who would that be? I am guessing some Scandinavian countries, maybe?
See the table here:
https://en.wikipedia.org/wiki/Collective_agreement_coverage
France, Austria, Belgium, Iceland, and Sweden all have above 90% collective bargaining coverage. Finland, Denmark, Italy, Netherlands, Norway, Australia, Luxembourg, Switzerland, and Germany are between 50% and 90%.
You should look elsewhere for reasons why Brazil is relatively poor today. I guarantee you unions have very little to do with it.