Think Tank Directory: A Guide to Nonprofit Public Policy Research Organizations. Edited by Lynn Hellebust. Topeka, KS: Government Research Service, 1996–. This is an annual guide that lists Think Tanks and their purpose.
NIRA's World Directory of Think Tanks. This is a guide to the most prominent and innovative public policy research institutes worldwide.
A few prominent organizations representing a variety of positions on illegal immigration with reports and other documents on their sites include:
The American Civil Liberties Union. The ACLU works in courts, legislatures and communities to defend and preserve individual rights and liberties.
Americans for Immigrant Justice - formerly, Florida Immigrant Advocacy Center (FIAC). FIAC specialize in advocacy for Haitian immigrants.
Center for Immigration Studies. CIS provides information about the social, economic, environmental, security, and fiscal consequences of legal and illegal immigration into the United States.
Federation for American Immigration Reform (FAIR). An organization that seeks to limit all immigration and stop illegal immigration.
Global Commission on International Migration. The GCIM was formed as an independent commission by the UN between 2003-2005. It prepared a series of reports and papers on the global phenomenon of migration.
Migration Policy Institute. Founded in 2001 by a well known scholars of immigration. MPI trys to propose policy solutions that benefit both immigrants and their countries of origin and immigration.
National Conference of State Legislators This organization provides an analysis from the point of view of state officials.
Pew Hispanic Center. Pew is a nonpartisan "fact tank" that provides information on the issues, attitudes and trends shaping America and the world. It does not take positions on policy issues.
The World Bank B-Span contains video of presentations by experts on the subject of migration.