In the US, a big part of the anti-union movement's success has been the fact that states retain enough autonomy to rig the rules in pro- or anti-union fashion,

In the US, a big part of the anti-union movement's success has been the fact that states retain enough autonomy to rig the rules in pro- or anti-union fashion, while also competing for business that can typically be located anywhere in the CONUS. As a result, it's a race to the bottom as governors try to pursue business-friendly policies to attract jobs. And on the other "side", to pursue union-friendly policies to attract votes. Both of which tug decisions to the extremes, the better to win their base, rather than seeking compromise that's acceptable to both parties. One reason proletarian internationalism remained a hotly debated topic in communist theory for decades.