Yes - union contracts may include a ban on non-union workers. As long as that's not mandated by law - it's really none of our business.
I would potentially be on board with outlawing such agreements altogether, but it's not fair to restrict unions to be unable to make exclusivity agreements when every other type of organization can.
If, as an employer, you would prefer not to adhere to strong labor protection laws in the market you desire to operate in, you are free to find markets more to your liking.
The richest 1%, with over $1 million in wealth, own 44% of the world's wealth, but we're going to keep chipping away at the middle class?
The hollowing out of the American middle class over the last 40 years due to globalization is what the end result looks like, hence why those in the Western world should not support further globalization efforts (including outsourcing offshore).
Just like an airplane, oxygen mask on yourself first, then help those around you.
https://www.npr.org/sections/thetwo-way/2015/12/09/459087477...
Middle class = 0.67(median household income) - 2.0(median household income)
Was there something wrong with the traditional definition of middle quintiles?