How many Spies?

[literature_Caro]

No: HPFGUIDX 136253

Hello everyone!

I don't know whether this has been posted already:

In POA when being in the Three Broomsticks shortly before Christmas
Harry, Ron and Hermoine overhear the talk of McGonagall, Hagrid,
Flitwick, Fudge and Madam Rosmerta. It is said there that DD had have
a lot number of spies (so more than one!) giving him information
during the first war (before Harry's parents were killed).
Does anybody have an idea who they are? One of course was Snape (no
matter whether he really was spying for DD or not) but who are the
others? Lupin? And who else? It sounds like up to five.

Caro