The kafala system is used to monitor migrant laborers, working mainly in construction and domestic settings in the Arab Gulf states. A foreign worker can only come into the Arab Gulf states through a kafeel (sponsor). However, the essence of the kafala system is the relationship of binding the employee to the employer, which has often been criticised as "slave-like". The kafala directly contradicts employment law in the UK. To learn more, read the following articles and case law on the system; Guardian Video - Kafala: the exploitative employment system that has spread to the UK The Guardian WikiTribune Court of Justice of the European Union The Independent BBC News