PayDay: first come, first served.
The engineer is in charge of the money pften keep it for himself. On that day, a gufire was heard to keep people calm as only the first workers secured their salary.
It is quite frequent that the Construction company work with the Immigration Office and report " illegal" workers at the end of the month: it is cheaper fo rthem to pay a the immagratio to deport them than to poay them for thei hard work. Then they bring new workers, helped by the immigration patrols, and so on. They get free manpower again and again.