Historically, the highest union representation in the U.S. has been only about 1/3 of the workforce. All the same, hard-won wages and benefits ended up being passed along to everyone, raising the standard of living for the entire workforce, union or not. I remember a line from a commercial for a union that went something like: “Brought to you by the people who gave us the weekend.” They could also have said health insurance, pensions, paid vacation and much more.
I remember my father-in-law, a Boeing employee and staunch union hater, telling me how stupid those strikers were, standing out there, losing pay while he went to work every morning. He said when it was all over, he would get the same raise they did, he wouldn’t have lost anything, and he still didn’t have to pay union dues. Boy, were they dumb.
Except without them, there would have been no raise, benefits would have been much different or nonexistent, working conditions would be “take it or leave it,” and he never figured that out.