Did you bid, without asking, on one of his corporations that had 10% hiring? That's known as a hostile bid, and it's an act of economic warfare.
If he wants to run corporations with 10% hiring, unfortunately, he has every right to. If they're in your country, it's entirely fair for you to ask him to move said corps out, but you definitely should ask first. If he refuses, give him a deadline, and then if he refuses to meet that deadline, it *may* be fair to bid/nationalise.