What's the actual process for reporting a production company if you're non-union?

Genuine question — if a non-union production is doing something unsafe or exploitative, who do you even report it to? Union actors have SAG-AFTRA. They can file a grievance and there are real consequences. Non-union actors have... what? The Better Business Bureau? A Facebook post? I've had two bad experiences this year — one with a company that didn't pay for 90+ days and one where safety on set was genuinely concerning (no stunt coordinator for a fight scene). In both cases I just... moved on. Because I didn't know what else to do. If anyone has actual practical experience reporting a production company, I'd love to hear what worked and what didn't.