The workers themselves own the company, make the decisions, keep the profits.
Imagine if the shareholders, management, and labor union were all one and the same, vs adversarial. It's really that simple.
Here's some (overly verbose) entry points into the topic.
https://en.wikipedia.org/wiki/Workers%27_self-management
https://www.resilience.org/stories/2020-03-11/worker-self-di...
https://www.democracyatwork.info/democratizing_the_workplace