SUBCONTRACTOR covenants and agrees that he shall not employ any labor which will interfere with labor harmony at the job site or with the introduction and storage of materials and execution of Work by other subcontractors. If SUBCONTRACTOR breaches this covenant and such breach shall cause a stoppage or Work at the job site, SUBCONTRACTOR shall be liable for all damages suffered by GENERAL CONTRACTOR caused by such delay in completing the job, including specifically any penalty or liquidated damages in the General Contract imposed upon GENERAL CONTRACTOR for failing to complete the job on the completion date set forth in such Contract