Related Clues:

• Labor feverishly
• Toil too hard
• Dred Scott, once
• Toil away
• Freedman, once
• Galley group
• Spartacus was one
• Captive worker
• Ben-Hur, for a time
• Toils away
• Harriet Tubman "passenger"
• Work your fingers to the bone
• Work with scant appreciation
• Bond servant
• Work one's fingers to the bone