I'm afraid I know nothing about this.
I'd prefer to see the government addressing inequalities first, as I don't remember the 1970s and 80s heavily unionised America as paradise.
For me, the big issue surrounds the inequality of incentives. Why are the best incentives only available to people at the top?
Not sure what will work, but one idea is this. Let everyone in an organisation share proportionate incentives atop their basic salary.