In Fellows v. Blacksmith, 19 How. 366, 372 (1856), a treaty with the New York Indians was asserted to be invalid on the ground that the Tonawanda band of Senecas was not represented in the negotiation and signing of the treaty, the Court disposed of that assertion by saying: "But the answer to this is, that the treaty, after executed and ratified by the proper authorities of the Government, becomes the supreme law of the land, and the courts can no more go behind it for the purpose of annulling its effect and operation than they can go behind an act of Congress."