The Special Immigration Appeals Commission (also known by the acronym SIAC) is a superior court of record in the United Kingdom established by the Special Immigration Appeals Commission Act 1997[1] that deals with appeals from persons deported by the Home Secretary under various statutory powers, and usually related to matters of national security.
[2] SIAC also hears persons deprived of British citizenship under the British Nationality Act 1981 as amended by Section 4 of the Nationality, Immigration and Asylum Act 2002.
[3] An appellant is represented to the commission by a special advocate who is a person vetted by the Security Service with controversy surrounding the use of secret evidence which only the judges and special advocates have access to.
[4] It previously had the power to certify a person as an international terrorist under Part 4 of the Anti-terrorism, Crime and Security Act 2001 until this was repealed by the Prevention of Terrorism Act 2005.
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