And how exactly do you want to register news organizations, or determine who should be registered and who not?
My guess would be those organizations that label themselves as news organizations.
I think a better option (and directly on topic) would be for certain "news" stations to better and more clearly identify which of their programs were opinion pieces. For example, certain programs are in a time slot that garners a majority of the target viewership where they are looking for
news, but they are getting "opinion" labeled as news, on a "news" channel, that claims to be fair and balanced.
"What can be asserted without proof, can be dismissed without proof."-Hitch.