The furnishing of the supply of labor only for the use of a contractor or subcontractor. Does not include contracts for supply of materials nor responsibility for the supervision of a project. This classification is for companies that provide labor only for contractors, when the scope of work, including labor and materials, exceeds $50,000 (or $10,000 for Electrical/Mechanical/Plumbing work, or $1 for Hazardous Materials work). No examination or credential is required. Labor Only is a subclassification of Building Construction; Highway, Street, and Bridge Construction; Heavy Construction; Municipal and Public Works Construction; Electrical, Plumbing; Mechanical; and Hazardous Materials.