People for the American Way, based in Washington, D.C., is a nonprofit organization that works to strengthen the separation between church and state.

The Coalition for the Separation of Church and State is a separationist umbrella organization. The website contains links to member organizations with contact information for each. Contact President Jeff Lucas via the website.

Americans for Religious Liberty is an interest group in Silver Spring, Md., that monitors issues of the separation of church and state. Albert J. Menendez, the ARL research director, has analyzed the religious makeup of each Congress since 1972. Contact Menendez

The Ethics and Public Policy Center is a conservative, Washington, D.C.-based think tank and advocacy group. Founded in 1976, the group describes itself as “dedicated to applying the Judeo-Christian moral tradition to critical issues of public policy” and advocacy of founding principles such as the rule of law. The EPPC’s president is Ryan T. Anderson.

The Catholic League for Religious and Civil Rights is a Catholic civil rights advocacy group that responds to religious discrimination issues concerning Catholics and other Americans. It is based in New York but has chapters throughout the United States. Bill Donohue is its president.

The Alliance for the Separation of School and State is a nonprofit working to remove government involvement in public school education. It is based in Clovis, Calif. Alan Schaeffer is its president.

The Acton Institute for the Study of Religion and Liberty promotes a free and virtuous society characterized by individual liberty and sustained by religious principles. The institute is ecumenical and defines itself as conservative. It is based in Grand Rapids, Mich. The Rev. Robert A. Sirico is president. Contact John Couretas, director of communications.    

The J.M. Dawson Institute of Church-State Studies at Baylor University in Waco, Texas, is devoted to research in the broad area of religion, politics and society and committed to the separation of church and state and the advancement of religious liberty around the world.

The International Center for Law and Religion Studies at Brigham Young University in Provo, Utah, promotes religious liberty and studies the relationships between governments and religious institutions. W. Cole Durham Jr. is a law professor and the center’s director.