Paul Marshall is a senior fellow at the Hudson Institute’s Center for Religious Freedom in Washington, D.C., and has written or edited many books about religion and politics. He served as editor and contributor for Radical Islam’s Rules: The Worldwide Spread of Extreme Sharia Law.

The American Civil Liberties Union issued a report in May 2011 about the push for anti-Shariah laws.

Robert Vischer is dean and professor of law at the University of St. Thomas in Minneapolis. His research interests explore the intersection of law, religion and public policy, and his books include Conscience and the Common Good: Reclaiming the Space Between Person and State.

Read a March 2012 article by law professor Robert K. Vischer in the journal First Things. He argues that anti-Shariah laws set a dangerous precedent that could damage religious liberty for all, not just for Muslims.

This April 8, 2013, graphic by the Pew Research Center gives state-by-state details about proposed or enacted legislation to limit use of foreign/religious law in court matters.

Read an Oct. 1, 2012, Religion News Service story about how anti-Shariah measures can complicate divorce for Muslim Americans.

Read a June 4, 2013, Religion News Service story about Missouri Gov. Jay Nixon’s veto of an anti-Shariah measure.

The Center for American Progress released a report May 16, 2013, on the status of foreign-law bans throughout the United States.

David Yerushalmi is co-founder and senior counsel at the American Freedom Law Center, a Michigan-based public-interest law firm whose motto is “fighting for faith and freedom.” He is a leading voice in the anti-Shariah movement.