The President may designate one or more organizations as successors in interest to deceased persons who, if alive, would be eligible to receive returns under the provisos of subdivision (C) or (D) of subsection (a)(2) thereof. In the case of any organization not so designated before the date of enactment of this amendment, such organization may be so designated only if it applies for such designation within three months after such date of enactment. The President, or such officer as he may designate, shall, before the expiration of the one-year period which begins on the date of enactment of this amendment, pay out of the War Claims Fund to organizations designated before or after the date of enactment of this amendment pursuant to this subsection the sum of $500,000. If there is more than one such designated organization, such sum shall be allocated among such organizations in the proportions in which the proceeds of heirless property were distributed, pursuant to agreements to which the United States was a party, by the Intergovernmental Committee for Refugees and successor organizations thereto. Acceptance of payment pursuant to this subsection by any such organization shall constitute a full and complete discharge of all claims filed by such organization pursuant to this section, as it existed before the date of enactment of this amendment. No payment may be made to any organization designated under this section unless it has given firm and responsible assurances approved by the President that (1) the payment will be used on the basis of need in the rehabilitation and settlement of persons in the United States who suffered substantial deprivation of liberty or failed to enjoy the full rights of citizenship within the meaning of subdivisions (C) and (D) of subsection (a)(2) of this section; (2) it will make to the President, with a copy to be furnished to the Congress, such reports (including a detailed annual report on the use of the payment made to it) and permit such examination of its books as the President, or such officer or agency as he may designate, may from time to time require; and (3) it will not use any part of such payment for legal fees, salaries, or other administrative expenses connected with the filing of claims for such payment or for the recovery of any property or interest under this section. As used in this subsection, “organization” means only a nonprofit charitable corporation incorporated on or before January 1, 1950 , under the laws of any State of the United States or of the District of Columbia with the power to sue and be sued.