Michigan voting on "right to work", what is the controversy here?

[JohnnyD]

Was gone for a few days and wanted to check and see if any of the anti-Right to Work crowd answered my very simple question. As expected, no one did, likely because they can't.

Tagger or spence, without conflating completely unrelated topics like child-labor laws, US working conditions from 50 years ago or China's lack of labor laws, What is the negative to giving today's US workers a choice to be part of a union or not?

Over the weekend, three other people I was talking to brought up the ridiculousness of Michigan's RTW law, yet not one of them could answer the above question. I think I'm starting to notice a pattern here.