1) Immigrant worker 2) Worker for wages 3) Workman 
• (n.) One who works by the day; -- usually applied to a farm laborer, or to a workman who does not work at any particular trade.
Day'-la`bor·er noun One who works by the day; -- usually applied to a farm laborer, or to a workman who does not work at any particular trade. Goldsmith. 
[n] - a laborer who works by the day
day labourer noun a laborer who works by the day; for daily wages