The kafala system is used to monitor migrant laborers in parts of the Middle East. The system works by requiring the unskilled laborers to have an in-country sponsor who is responsible for their visa and legal status. This system is often criticized because it creates easy opportunities for the employers to exploit the workers.
Migrant workers make up a third (8 million) of the population and over half the workforce in Saudi Arabia; they are mainly unskilled labourers and domestic workers. So it big part of Saudi population they have so many issue to deal with