Daniel Alan 'Dan' Stein (1955–2025) was an American attorney and prominent immigration policy advocate best known as the president and executive director of the Federation for American Immigration Reform (FAIR), a nonprofit organization founded in 1979 by John Tanton that advocates for stricter immigration controls and reduced levels of both legal and illegal immigration in the United States. A native of Washington, D.C., Stein earned a bachelor's degree from Indiana University and a Juris Doctor from the Columbus School of Law at The Catholic University of America in 1984. He joined FAIR in 1984 as a staff attorney and rose through the ranks, serving as president since 1988 and as executive director since 1992, with Source B noting he succeeded Tanton as executive director in 2003. Under Stein's leadership, FAIR became an influential voice in conservative immigration debates, lobbying Congress, supporting litigation, and funding research to promote policies like enhanced border security, merit-based immigration systems, reduced legal immigration quotas, and opposition to amnesty programs and sanctuary cities. He frequently testified before congressional committees and appeared in media outlets like C-SPAN and The Washington Times to argue that immigration reform is essential for national sovereignty and economic stability.

Stein's tenure at FAIR was marked by significant controversy. The Southern Poverty Law Center (SPLC) designated FAIR as a hate group, accusing it of promoting nativist and anti-immigrant rhetoric, ties to white nationalist ideologies, and receiving funding from controversial sources like the Pioneer Fund (with historical links to eugenics) and the Colcom Foundation. FAIR and Stein vehemently denied these claims, asserting their positions were rooted in fiscal and cultural preservation concerns. Stein was involved in high-profile legal challenges, including opposition to DACA and support for Trump-era policies like the border wall, and collaborated with figures like Kris Kobach on restrictive immigration legislation. His work extended to coordination against pro-immigration advocates like Janet Murguía and partnerships with Roy Beck on projects. FAIR received significant funding from donors such as the Colcom Foundation and Donors Capital Fund, with controversial hidden ties to the Pioneer Fund via straw donors. Stein faced investigations from watchdogs like Heidi Beirich and was adversarial with immigrant rights groups. His work influenced Republican platforms and immigration discourse, but was condemned by civil rights groups for fostering division. Stein passed away on December 6, 2025, at age 70, leaving a polarizing legacy as a key architect of the modern anti-immigration movement and restrictionist immigration policy networks in the U.S.