Interest or other charges heretofore or hereafter collected on loans shall be credited to the revolving fund created by section 5113 of this title and shall be available for the establishment of a revolving fund for the purpose of making and administering loans to Indian-chartered corporations in accordance with the Act of June 18, 1934 (48 Stat. 986) [25 U.S.C. 5101 et seq.], and of making and administering loans to individual Indians and to associations or corporate groups of Indians of Oklahoma in accordance with the Act of June 26, 1936 (49 Stat. 1967).