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.

The Center for the Study of Law and Religion at Emory University in Atlanta focuses on religion and the law worldwide. It is headed by John Witte Jr., a professor of law and ethics and an expert on religious liberty.

The Center for Church-State Studies at DePaul University School of Law is a nondenominational entity that promotes debate and discussion about the First Amendment and the Establishment Clause. It is in Chicago.

The website maintained by the First Amendment Center at Vanderbilt University in Nashville, Tenn., is a lengthy and comprehensive source on First Amendment issues, cases and history.

Focus on the Family is a conservative group that supports churches’ right to campaign. The founder of this organization is James C. Dobson who was also former chairman and president.

The American Center for Law and Justice is a politically conservative, Christian-based legal organization in the United States. It is headquartered in Washington, D.C., and associated with Regent University School of Law in Virginia Beach, Virginia.