Did Dumbledore know that Fake Moody = Crouch?

[jodel at aol.com]

No: HPFGUIDX 48688

Rehan asks;

<< The question, then, that still remains is how exactly did Dumbledore come 
up with the idea of it being Crouch so quickly?  What could he have known 
beforehand that would lead him to this assumption?  Please, try to answer 
this, as I am totally confuzzled!   >>

The answer, I believe, is in the chapter "The Madness of Mr Crouch".

When Harry runs off to fetch Dumbledore, one of the things he tells D is that 
Crouch mentioned his son. Now, Harry doesn't say -- at that point -- that he 
had only mentioned him to say that he had gotten 12 OWLs while his wits were 
wandering in some fugue state. Later, when they went over just what was said 
that was made clear, but the suggestion of Barty Crouch Jr having some 
significance in what was going on had already been made, and Dumbledore isn't 
so likely to completely write off something as soon as a piece of conflicting 
information comes up as the kids are. 

So, at that point, Dumbledore knows that Voldemort, with Wormtail's aid, has 
somehow managed to tamper with the Tournement. He knows that there is a spy, 
and he knows that Crouch has been gotten to at some point. He also knows that 
Crouch's wits turned to his son when they were wandering. Once the spy was 
identified as Fake!Moody, Dumbledore also knows that whoever this person 
really is, they were already established within the school before the 
delegations from Beaubatons and Durmstrang ever arrived.

Dumbledore's quite sharp enough to put this last piece of information 
together with the fact that, somehow, whatever is going on has probably got 
some association with the Crouch household -- which is more than ample reason 
to call in the Crouch House Elf to see if she can recognize whoever it is, if 
he cannot.

-JOdel