translate English to French: The claimant explained to the Board of Referees that his union had the monopoly over his field of work and that every employer had to go through the union to hire a welder.
Devant le conseil arbitral, le prestataire a expliqué que, dans son domaine de travail, son syndicat avait le monopole et que tout employeur devait passer par le syndicat pour embaucher un soudeur.