If your company has an HR department, start by filing a formal complaint with that department. (rocketlawyer.com)
Domestic violence is a legal ground for divorce, but many women are reluctant to file formal complaints against such abuse. (globaleducationmagazine.com)
By the way if they are in fact breaking a rule then file a formal complaint and ensure it gets dealt with, its your right as a board member. (remonline.com)