Answer: slave

AnswerCrossword Clue
SLAVESpartacus, for one
SLAVEWork your fingers to the bone
SLAVE"Amistad" character
SLAVESerf, essentially
SLAVEWork too hard
SLAVEBust one's hump
SLAVEExploited worker
SLAVEJoseph, while in Egypt
SLAVEDred Scott, e.g.
SLAVEPut in long hours
SLAVEPlug away
SLAVEComputer peripheral
SLAVEToil (away)
SLAVEDrudge
SLAVE"12 Years a ..."
SLAVEToiler
SLAVEWage -
SLAVEWork day and night
SLAVEWork like a dog
SLAVEWork, work, work
slaveto work like a drudge
SLAVENat Turner, e.g.
SLAVEWork really hard
SLAVESpartacus, e.g.
SLAVEDred Scott, once
SLAVECanada's Great .. Lake
SLAVE"Amistad" passenger
SLAVEGreat .. Lake
SLAVEToil
SLAVEVerdi's Aida, e.g.
SLAVEBond servant
SLAVEEsne
SLAVEOld plantation worker
SLAVEWork hard
SLAVEAmistad passenger
SLAVEEmancipation Proclamation subject
SLAVEHarriet Tubman "passenger"
SLAVEThirteenth Amendment beneficiary
SLAVEUnderground Railroad traveler
SLAVEDred Scott or Nat Turner