http://www.scotusblog.com/2018/08/judge-kavanaugh-on-work-law/
https://www.nolo.com/legal-encyclopedia/off-duty-conduct-employee-rights-33590.html
As to organized labor, union leadership should consider such a record and taking a strong unified public position against the man's elevation, and should as well consider things beyond organizing and bargaining collectively, e.g., Nolo, here.