The men who did the work were thoroughly honest. They were supervised by four Levites: Jahath and Obadiah of the clan of Merari, and Zechariah and Meshullam of the clan of Kohath. (The Levites were all skillful musicians.)
So Joseph made it a law for the land of Egypt that one-fifth of the harvest should belong to the king. This law still remains in force today. Only the lands of the priests did not become the king's property.