Lestranges' crime

[Amy Z]

No: HPFGUIDX 8694

Steve or anyone,

On the "Azkaban" page of the HP Lexicon it says, that the Lestranges are 
incarcerated "for Cruciatus assault on the Longbottoms."  I thought this was 
the case but I also thought it wasn't spelled out who, besides Crouch, was 
convicted of the attack on the Longbottoms.  Can you give me a reference?  
Is it in the Pensieve?

Thanks,
Amy Z.
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