So, I know very little about Right to Work legislation (essentially I know what the topic being discussed is from the first paragraph of Wikipedia).
Without scrying after the motives of those in favor or against, what is the actual concrete problem with Right to Work legislation? What is the concrete benefit?
I think it's fair to say a good default is "people can negotiate anything they want", but negotiating monopoly supply of workers seems like it has the potential to be a useful exception (as are most monopoly situations). Like many policy issues, it seems like it'd come down to the details.
[Edit: to wit, one question I'd like answered is whether union monopoly supply effects only employers with large numbers of employees or also employers looking to hire only a couple people. I think it is the former, but if, by whatever means, it is all firms, that might be worth stopping.]