Could you provide some evidence for this rather remarkable claim? > It is likely that engineers at FAANG companies would make less money if they join a union,

Could you provide some evidence for this rather remarkable claim? > It is likely that engineers at FAANG companies would make less money if they join a union, because the union would level people out by negotiating a standard salary for workers at similar levels at all companies. I haven't seen anyone refute this. More than one union exists in the world, they also compete with each other to offer their members the largest benefits. I don’t see why unionisation would reduce pay competition, if anything it should increase it by ensuring that anti-poaching agreements never happen.