Since unions are about common interest and ideally orthogonal to ideology, I’ll add that my subjective interest, as someone living in Russia, is that US tech workers were offshored and/or replaced by immigrants. Because that will long-term weaken the US as an aggressive nation, by losing qualifications.

At the same time if US tech unionized, that could mean weakening the incentive for that aggressive behavior, and weakening big companies.

Hard to decide really. Basically the only bad variant is if it’s half-done, enough unionization to stabilize, but also not too much so that they’d still have enormous foreign labor resources. That would mean very powerful corporations and no change in politics.