I've worked for 3 different companies in 3 different at-will employment states, 1 was a small company, 1 was a small subsidiary of a huge company, and the current one is just a massive company of over 20,000 people. None of them are/were unionized, and I've never encountered a single problem that I felt a union would've been able to solve better than I did on my own. I've never even met anybody at the companies who felt like it would improve if it was unionized. So when people say things like "most businesses treat people bad without unions", I find it very hard to believe.