I think he means from STATE to NATIONAL.
If this is the case, it prevents Ceo's from bidding and possibly taking over your corporation. Bare in mind, only your best and most prized corporations should be nationalized. It's usually best to have your military and high value corps nationalized.
If you are reffering to, Private Control Corporations and nationalizing, just don't. No one likes it, and it causes a big headache, mainly for you. Trust me on that.
Hope we've helped.