Only certain applications of HR-4173 (regarding sanctions/punishment against individuals - criminal punishment) cannot be retroactively applied as argued in several courts.
The role of the FDIC (as described by HR-4173) continues as is until argued in court.
Something that neither Weil, Gotshal & Manges LLP or Susman Godfrey L.L.P. or anyone for that matter has argued
(The constitutionality of both seizure and retention/transfer of assets - criminal in opinion, legal by law or perhaps "legal" from lack of enforcement).
For more information ex post facto law as applied to civil matters and administrative law. I believe FDIC seizure and role falls under civil for seizure, administrative for post seizure actions. It might be considered administrative for both seizure and post-seizure actions.
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You should read what the response was to. I have no idea which law wowalters was vaguely not referring to (post 451467).
FDIC-Resolution has a process, one of which requires filing proofs of claim. A part of the process which WMILT has not done.
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By the way, if I remember correctly you're in the $10(ish) billion camp of escrow from FDIC or was that fwh33?