If and when the Unemployment Trust Fund in the Treasury of the United States, ceases to exist, or such separate book account of the Unemployment Trust Fund is no longer maintained, all monies belonging to the Unemployment Compensation Fund of this state shall be administered by the Commission as a trust fund for the purpose of paying benefits under this act, and the Commission shall have authority to hold, invest, transfer, sell, deposit, and release such monies, and any properties, securities, or earnings acquired as an incident to such administration; provided, that such monies shall be invested in the following readily marketable classes of securities: Bonds or other interest-bearing obligations of the United States of America or guaranteed both as to interest and principal by the United States; provided further, that such investment shall at all times be so made that all the assets of the fund shall always be readily convertible into cash when needed for the payment of benefits. The Treasurer shall dispose of securities or other properties belonging to the Unemployment Compensation Fund only under the direction of the Commission.