Note how all your examples are decades removed from present times.
Employers these days can't murder their employees like they used to. Well, in some countries they still can, and in all the others they can (if the employer doesn't quit first) it's just frowned upon and you'll get a bad rap if your company gets outed as being a company ran by Psychopaths/Sociopaths. That's basically all that happens.
But it's still better than nothing.