Raju is a daily wage labourer and is the only bread winner of the family. He puts in twelve hour shifts for six days in an unclean, dimly lit, and poorly ventilated tannery. Despite toiling hard for the entire day, tanning the animal hide, he recieves only 150 Rupees per day. He recieves no medical leaves, paid leaves, increment and other benefits. Besides, he can be terminated from his contract of employment any time. Raju is a _________ worker