> The tech unionization movement is full of people who favor open borders and the like
In my experience, tech unionists fall into one of two camps:
* The progressive camp, which is largely what you describe. Likes open border, diversity hiring and the like.
* The protectionist camp. Wants to limit immigration, require CS degrees, and clamp down on H1B hires.
The former seems to care more about influencing the politics of the company. The latter is more the traditional union stance, which is to increase the price of labor by restricting the supply.