Columbia subject headings:
Harvard subject headings:
Emigration and immigration law--United States
Illegal immigration--Government policy--United States.
Noncitizens--Government policy--United States
Terrorism--United States--Prevention
Terrorists--United States--Identification.
U.S. Citizenship and Immigration Services--Management--Evaluation.
Princeton subject headings:
Emigration and immigration law--United States.
Illegal aliens--Government policy--United States.
Terrorism--United States--Prevention.
Terrorists--United States--Identification.
U.S. Citizenship and Immigration Services--Management--Evaluation.