I think this is a great idea. A professional accreditation that is managed by journalists would definitely help with preventing misinformation and disinformation. Require certain number of years working under a professional journalist and an ethics exam (similar to PEng) to be a "Professional journalist". Then government can legislate rules at the recommendation of this body around whether an organization can be called a "news organization" and is protected by freedom of the press laws. This way the managing body can strip people of their professional accreditation for peddling misinformation and disinformation and general journalistic malpractice.