The Southeastern Legal Foundation is a legal advocacy group based in Marietta, Ga., and Washington, D.C. Its lawyers have argued in support of prayer in public places and for the public display of the Ten Commandments. Contact Todd Young.

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 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 Heritage Foundation is a nonprofit think tank devoted to conservative public policies. Noah Weinrich is director of media and public relations.

Faith and Action is a nonprofit that advocates for Christian values in Washington, D.C., by meeting with policy-makers and politicians. One of its major projects is presenting politicians with Ten Commandments plaques and displays. Its founders are Paul and Rob Schenck. Schenck is also its president. Contact Peggy.

The Education Department published a guide about freedom from religious discrimination at public schools.

The U.S. Department of Justice’s Civil Rights Division maintains a site on religious discrimination issues, which includes information on religious liberty.

The Pew Forum on Religion & Public Life maintains a collection of resources on religion & the law.

William Mumma is president and general counsel of the Becket Fund for Religious Liberty. Organization officials have said preachers should be free to say whatever they want without threatening their churches’ tax-exempt status.