Because of rules about non-profit status in the US and ALA's nervousness about it, advocating for *workers* is done by a separate, linked, organization called ALA-APA.
This organization has been around for over two decades but ebbs and flows in its impact. It's been ebbing lately which is too bad, library work can be challenging and poorly paid, even as people are generally very supportive of libraries and their workers.
https://ala-apa.org/nlwd/