One difficulty I see with the mission statement ( https://alphabetworkersunion.org/principles/mission-statemen... ) is that it is very broad, and contains a lot of progressive values that are likely not as widely shared as the authors might expect. One might or might not agree with these values, but it is going to be significantly harder to start steering the company's product direction and social responsibility effo…
This is exactly why I would never join a tech union. Just read their mission statement: this is about enforcing political goals via any power source they can get their hands on. Much like a lot of recent codes of conduct in open source projects.
I'm not sure comparing unions to code of conducts are suitable. Unions are a historically old and proven way for workers to enact change in workplaces, industries and even entire countries. Code of conducts in open source is a fairly new invention (officially, written down ones at least) with no such track record.