Joseph P. Bradley, Barney v. Watson — Opinion of the Court
“ Swartwout, 10 Pet. 137, decided in 1836, affirmed the principle which had been established by previous authorities,-that money paid to a collector for duties illegally demanded, if paid under compulsion, in order to get possession of the party's goods, or to prevent their being seized for the duties, may be recovered against the officer in an action at common law, provided the payment be made under protest and with full notice of the intent to sue, so that the officer may protect himself by retaining the money in his possession ”
