23. If it be stipulated in any contract that workmen, or the members of a syndicate, union or federation of syndicates shall receive a stated wage, such workmen or members, although not a party to the contract, are entitled to the rate of wages therein stated, notwithstanding any renunciation thereto afterwards agreed upon by them, whether express or implied.
R. S. 1964, c. 146, s. 22.