Immigration: Terrorist Grounds for Exclusion and Removal of Aliens [Updated July 2, 2008] [open pdf - 151KB]
From the Summary: "The Immigration and Nationality Act (INA) spells out a strict set of admissions criteria and exclusion rules for all foreign nationals who come permanently to the United States as immigrants (i.e., legal permanent residents) or temporarily as Non-immigrants. Notably, any alien who engages in terrorist activity, or is a representative or member of a designated foreign terrorist organization, is generally inadmissible. After the September 11, 2001, terrorist attacks, the INA was broadened to deny entry to representatives of groups that endorse terrorism, prominent individuals who endorse terrorism, and (in certain circumstances) spouses and children of aliens who are removable on terrorism grounds. The INA also contains grounds for inadmissibility based on foreign policy concerns. […] Legislation has been considered in the 110th Congress that would modify the terrorism-related grounds for inadmissibility and removal, as well as the impact that these grounds have upon alien eligibility for relief from removal. The Consolidated Appropriations Act, 2008 (P.L. [Public Law] 110-161), enacted in December 2007, modified certain terrorism-related provisions of the INA, including exempting specified groups from the INA's definition of 'terrorist organization' and expanding immigration authorities' waiver authority over the terrorism-related grounds for exclusion. H.R. 5690 (P.L. 110-257), which was enacted into law on July 1, 2008, expressly excludes the African National Congress (ANC) from being considered a terrorist organization, and provides immigration authorities the ability to exempt most terrorism-related and criminal grounds for inadmissiblity from applying to aliens with respect to activities undertaken in opposition to apartheid rule in South Africa."
CRS Report for Congress, RL32564