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Originally Posted by teddylupin  The first one is a tad ambiguous, it really isn't covered well, but its' implied that Voldemort thinks Snape has some unnamed source of information in or close to the Order. Dumbledore's portrait was possibly confided in by an Order member, especially someone like McGonogall. Or he continues to be manipulative and omnipresent in death, and his portrait has some way of getting information- possibly through other portraits. |
Mundungus Fletcher.
I think they used him in both directions. To make the order what Dumbledore wanted, and on the other side Snape could say that he has got the information from him.