But the problem is that employers also have high barriers of entry (it's not easy to switch jobs, especially if you have to relocate), and there's usually low c

But the problem is that employers also have high barriers of entry (it's not easy to switch jobs, especially if you have to relocate), and there's usually low competition for blue collar work, since there's higher demand, which makes employers have overwhelming leverage. There are industries where that doesn't apply as much, and you can see that workers can get better compensation and benefits in those. Unions can equalize that leverage. I do think that unions could also have too much leverage, but I think that finding a happy medium is a worthy legislative goal.