This NLRB complaint was discussed yesterday: https://news.ycombinator.com/item?id=25278781. The document is here: https://cdn.vox-cdn.com/uploads/chorus_asset/file/22140676/C...
These threads from a year ago are related:
https://news.ycombinator.com/item?id=21520129
https://news.ycombinator.com/item?id=21634095