No moneys or annuities stipulated by any treaty with an Indian tribe for which appropriations are made shall be expended for, or paid, or delivered to any tribe which, since the next preceding payment under such treaty, has engaged in hostilities against the United States, or against its citizens peacefully or lawfully sojourning or traveling within its jurisdiction at the time of such hostilities; nor in such case shall such stipulated payments or deliveries be resumed until new appropriations shall have been made therefor by Congress.
(R.S. § 2100;
[May 29, 1928, ch. 901, § 1(81)], [45 Stat. 992].)