Labour migrants are a backbone of the economies of all the member states of the Gulf Cooperation Council–Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates. While much has been reported on the abuses these workers often suffer, very little is known about what happens to them when they are arrested and detained. This GDP Special Report helps fill this gap. Based on a two-year investigation, this report shows that while all the Gulf states provide constitutional guarantees against arbitrary or unlawful arrest and imprisonment, they all make widespread use of forms of immigration-related detention for the purposes of punishing or deporting foreigners, often in situations that may be considered arbitrary or otherwise contrary to human rights norms. Read report.