Related Clues:

• The work force
• One side of a dispute, often
• Proceed laboriously
• Partner of parts
• Blood, sweat and tears
• Hard labor
• The 'L' of A.F.L.-C.I.O.
• Elaine Chao's department
• British party
• Day in September
• Mechanic's charge
• Big voting bloc
• Toil
• One side of a strike mediation
• Line on a repair bill