Earlier quoted context omitted.
I think all of them, given that workers are severely underpaid compared to the value they provide, and have no means to influence the future of the company, other than to speak up and be fired. Though it's possible that the parent was referring to Amazon warehouses where workers had to pee in a bottle to keep their productivity points above the cutoff level.
They're paid at the level they will accept for the job they provide. Amazon couldn't hire 100,000 people in a month if they were underpaying anyone. Also, why should they have means to influence the future of the company? They're hired voluntarily to do one job, not to lead the company.
Why should they have means to influence the future of the company? That's been repeatedly proven in court and enshrined in law.