Use of Assets of State Retirement Systems.

All of the assets, proceeds or income of the teachers', employees', state police, public and judicial retirement systems of Alabama, or any successor systems thereto, and all contributions and payments made to such systems to provide for retirement and related benefits thereunder, shall be held, invested as authorized by law, or disbursed as in trust for the exclusive purpose of providing for such benefits, refunds and administrative expenses under the management of the boards of control of the aforementioned retirement systems; and, none of such assets, proceeds, income, contributions or payments shall be used, loaned, encumbered or diverted to or for any other purpose whatsoever.