What planet are you from?
Never heared of Nike? Or Apple? Or Shell? Or Microsoft?
Nike knowingly support(s/ed) child labour.
http://www1.american.edu/ted/nike.htm
Apple likewise, but they sure are no exception.
http://www.telegraph.co.uk/technology/apple/7330986/Apple-admits-using-child-labour.html
Shell oppressed people in africa that didn't like them poisoning their water.
http://www.aljazeera.com/news/africa/2013/01/2013130214524796.html
Microsoft oprressed competitors and was convicted for abusing their monopoly on the browser market.
http://en.wikipedia.org/wiki/European_Union_Microsoft_competition_case
All big tech companies use patents to oppress each other and the new guys. Absolutely massive waste of resources.
And those are just the obvious ones and not even really monopolies. If they had the freedom to become more monopolistic there would be worse examples of disgressions.
But companies misbehave all the time. On any levels. I could go on and on stating court cases where companies were acting oppressingly against persons or other companies.
What is needed , and this counts equally well for a free market as for a regulated market or even a government, is a way for society to control the future of any large accumulation of capital. If these large structures are left to themselfs they can become increasingly selfish.
I don't see any coercion in any of those actions. All employees were always free to leave. As far as Shell poisoning water is concerned, since when was Shell responsible for the water there? The state is the entity in control of water quality there, and I'm sure that Shell didn't have the troops, not Shell, so once again, the state fails.
Microsoft coerces no-one to buy their products or work for them, same with Apple.
Microsoft included a browser in an OS, no issues there, either buy it or go with Linux of FreeBSD.
So far, you have only proven my point that the state is bad.
Have you never heard the saying "Caveat Emptor"? You and your ilk want a state to protect you from your own folly.
OK, so, can you provide any real cases where a company, not a government, oppressed anyone?