§ 108. Workmen's compensation insurance on public works. Each
contract to which a political subdivision or any officer, board or
agency thereof, or of any district therein, is a party and which is of
such a character that the employees engaged thereon are required to be
insured under the provisions of the workmen's compensation law, shall
contain a stipulation that such contract shall be void and of no effect
unless the person or corporation making or performing such contract
shall secure compensation for the benefit of, and keep insured during
the life of such contract, such employees, in compliance with the
provisions of the workmen's compensation law.