Unless Congress by law authorizes such action, neither the President nor any person or agency shall on behalf of the United States (a) subscribe to additional shares of stock under article II, section 3, of the Articles of Agreement of the Corporation; (b) accept any amendment under article VII of the Articles of Agreement of the Corporation; (c) make any loan to the Corporation. The United States Governor of the Corporation is authorized to agree to an amendment to article III of the articles of agreement of t