I do not know what the other poster is referring to, but things like this are often indirect consequences. The unions may not be literally, directly suppressin

I do not know what the other poster is referring to, but things like this are often indirect consequences. The unions may not be literally, directly suppressing wages, but their other policies may be strongly causing it. Across history, trying to "do good" by force/law/policy has caused a lot of negative side effects.