It is better for K4 and Atlas if they are both in the same union. That way we can support each other better for strikes (like Atlas did for ABX), and avoid undercutting each other for pay and conditions in our contracts.
The 0.1% in the US have done a masterful job of dividing their workers, to keep them down. It has gotten to the point that many workers, who work in industries that are mostly/partially unionized, or formerly unionized, are AGAINST unions. That is EXACTLY what the 0.1% needs to keep most of the money for themselves. The best the working classes ever had it in US history was when the highest % of workers were in unions.
A huge part of the Black/White racism and other racial issues in the US, have been intentionally created by the 0.1% to keep us fighting each other, and ignoring the ever-increasing money flow to the top. If the workers of the US united, the 0.1% would only have their fair share of the money, instead of their fair share, plus 80% of our fair share.
Namaste...