In any election heretofore or hereafter held under the Act of June 18, 1934 ( 48 Stat. 984 ) [ 25 U.S.C. 5101 et seq.], on the question of excluding a reservation from the application of the said Act or on the question of adopting a constitution and bylaws or amendments thereto or on the question of ratifying a charter, the vote of a majority of those actually voting shall be necessary and sufficient to effectuate such exclusion, adoption, or ratification, as the case may be: Provided, however, That in each instance the total vote cast shall not be less than 30 per centum of those entitled to vote. (June 15, 1935, ch. 260, § 1, 49 Stat. 378 .) Editorial Notes References in Text Act of June 18, 1934 , referred to in text, is act June 18, 1934, ch. 576, 48 Stat. 984 , popularly known as the Indian Reorganization Act , which is classified generally to this chapter. For complete classification of this Act to the Code, see Short Title note set out under section 5101 of this title and Tables. Codification Section was formerly classified to section 478a of this title prior to editorial reclassification and renumbering as this section.