Well, for example, I've looked at the legislation of the law society of which I'm a member. It allows the Attorney General to intervene in certain situations to require documents and things like that.
I think the same would be true with most other regulatory bodies. The ministers responsible would have the power to intervene if they believed that the body was not running its affairs in accordance with the public interest. I'm not aware of there being some kind of superbody in Ontario.