a person who must work hard and long at unpleasant or uninteresting task

slave, very hard worker

a person who is the property of another person; a person forced to work very hard for someone else

person who serves, often under duress

a person who finds it difficult to stop working, e.g. a business person, writer, researcher

slave, very hard worker

a person who works in a factory or in a semi-skilled job, especially people in the working-class; a person who works in the way mentioned or at the job mentioned

person who is employed