the supervisor was shown the door rather quickly, that tech had friends in high places.
Very effective.... use a sacrificial supervisor/lower-level-employee to break the law and fire folks over Section 7 rights exercise / unionization attempts.. Supervisor fired, and plausible deniability regained.
In theory they could still be sued, but it's probably exceedingly unlikely.
That's why... if you want to do a unionization effort, then you better make sure it succeeds, and ideally involve observers outside the company with legal assistance.
Initially... some verbal discussions of pay information in safe place off work premises is probably harder for management to combat.
Ideally, there would be legal papers written up, letters already crafted, and backup plans established to address retaliation attempts, before management becomes aware... if an organizer gets canned, then management should be served with legal papers the same day.