Crossword Puzzle Unpaid workers?

Clue: Unpaid workers?

Unpaid factory workers (ROBOTS with 6 letters)
Unpaid workers (SERFS with 5 letters)
Unpaid mine workers (BURROS with 6 letters)
Evaluations by fellow workers (PEERASSESSMENTS with 15 letters)
Workers of the soil (ANTS with 4 letters)
Part-time workers (TEMPS with 5 letters)
Eugene who helped start the Industrial Workers of the World (DEBS with 4 letters)
Workers skilled with tongs (ICEMEN with 6 letters)
Underground workers (MOLES with 5 letters)
Unpopular workers (SCABS with 5 letters)