They are less likely but that does not mean it hasn't happened. The first air strike on united states ground was the national guard striking miners at the behest of the company.
If you're in another country working for a U.S. corp you're in much worse shape. Coca-Cola can murder you for forming a union in another country and get away with it!
No, Corporations absolutely do do violance to their employees. Contrariwise, dictators seldom use violence outside their borders unless they are powerful enough.
Governments on the other hand have a monopoly on violence, so I am more wary of handing them power over the choices I can make in my life.