 The Sioux filed a petition in 1923, but the Claims Court dismissed the case in 1942, holding that the Court could not second guess whether their compensation under the 1877 Agreement reached by the Manypenny Commission - which served as the basis for the 1877 Act of Congress - was adequate.The Sioux (and many other tribes) continued lobbying Congress for a forum for their claims, and in 1946 Congress created an independent federal agency, the Indian Claims Commission, to "hear and determine all tribal grievances" including the Sioux claim.The Sioux lost their first hearing before the Indian Claims Commission "due to the failings of their former counsel," but on appeal to the U S Claims Court, the Court directed the Commission to take new evidence, which it did in 1958.