A company can bar the exits, letting you burn to death [0]. A company can send private militias to force you to work [1] (or because you were sent the wrong set of MtG cards [2]). A company can improperly store pesticide, until the resulting explosion kills thousands [3]. A company can own every house and store in a town, managing your expenses to ensure you can't leave [4]. A company can bribe judges to provide them with child labor [5].
Some of these were illegal at the time they were done. Some of these were made illegal as a result of these events. All of them are within the nature of companies, optimizing in pursuit of profit regardless of the human cost. That nature is useful for improving lives, but must be carefully controlled to prevent it from trampling us all.
[0] https://en.wikipedia.org/wiki/Triangle_Shirtwaist_Factory_fi...
[1] https://en.wikipedia.org/wiki/Pinkerton_(detective_agency)
[2] https://gizmodo.com/magic-the-gathering-leaks-wizards-wotc-p...
[3] https://en.wikipedia.org/wiki/Bhopal_disaster