Isn’t it pitting some employees against management? I’ve seen the articles discussing dismissals of prominent members of the union fight, but haven’t seen anything about employees fighting each other because of the unionisation.

The pro-union group within the roughly 110 person company doesn't have enough employee support required to establish collective bargaining. The pro-union group does not want unionization to go to vote because of this, so instead they've chosen the tactic of creating bad PR for the company management and the demand that company management accept unionization without employee vote. Employees who are both pro and against unionization have concerns about how the union organizers have acted and that it may be detrimental to the long term health of the company.

About 20% of the company publicly, openly supports unionization but 2 people got fired. From the rest, almost 100% of them have received a raise or a promotion during the same period.