Summary

Pierce Butler Klamath Moadoc Tribes v. United States…

Even if judicially cognizable, as would be a like contention in ordinary litigation between individuals, plaintiffs' insistence that inadequacy of consideration invalidates the release could not here be sustained. That is so because the findings fail to show that any person acting for the United States deceived or misled plaintiffs as to the value of the land, or, indeed, had knowledge of any fact bearing upon its value that was not well known by plaintiffs when they made the settlement and gave the release. Mere inadequacy of consideration is not enough.
Source: Wikisource

Pierce Butler Klamath Moadoc Tribes v. United States…

Plaintiffs maintain that it is covered by the clause 'for the failure of the United States to pay said Indians any money or other property due.' There is here involved no question as to the adequacy of that language to cover any of the claims referred to in plaintiffs' application to the Congress; we are considering whether it extends to this claim, assuming that prior to the enactment it had been effectively released. If the release stands, no money or property is due plaintiffs, for the settlement and release wiped out the claim.
Source: Wikisource

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