The General Assembly shall enact no legislation which diminishes or eliminates the rights or benefits granted to any individual under any municipal retirement or pension system. Nothing contained herein shall prevent any municipality, covered under the Connecticut Municipal Employees Retirement Act, from becoming a member of the Old Age and Survivors Insurance System under Title 2 of the Social Security Act.
Conn. Gen. Stat. § 2-14a
(1963, P.A. 619.)