It doesn't even have to be outright intentional abuse in order to be a really shitty situation. The story for going home at time X can no longer be something li

It doesn't even have to be outright intentional abuse in order to be a really shitty situation. The story for going home at time X can no longer be something like "I need to sleep in order to be productive tomorrow", so it'll morph into something like "I don't particularly care about the success of the company" and you'll get branded as a bad employee. No top-down force required, just a shift in common knowledge about what your capabilities are.