(Galesburg, IL)  –  The hiring of non-union labor workers by the contractor for construction work at the Knox County Courthouse has caused a minor setback and will likely result in an additional cost to the county because of the delay.  A cement supplier refused to cross an informatial picket line of representatives of Local 647 operating engineers and Local 538 Laborors who are located outside of the courthouse while the non-union workers, working for Trotter General Contractors based in Macomb are working to replace the sidewalks.  The unions are protesting the contractors decision to hire non-union employees.  Knox County officials say that the non-union workers are being paid prevailing wages.  The cement work was to have started last weeek on Wednesday, but instead did not start until Monday of this week.