Archbishop Thomas G. Wenski of Miami, Fla., has headed the U.S. Catholic Bishops’ International Policy Committee, which pressed for more action to stop the killings in Darfur.

John C. Danforth, an Episcopal priest and a former U.S. senator, has served as special envoy to Sudan under President Bush and also as U.S. ambassador to the United Nations from 2004-2005.

The United States Holocaust Memorial Museum in Washington, D.C., commemorates those who died in the Holocaust and strives to confront bigotry and genocide throughout the world today.

Human Rights Watch is an independent, nongovernmental organization dedicated to protecting human rights worldwide. Contact HRW via one of its local offices.

Ricken Patel is founding President and Executive Director of Avaaz, “a global web movement to bring people-powered politics to decision-making everywhere.” Avaaz has more than 20 million subscribers and activists.

Gregory Stanton is president of Genocide Watch, a Washington, D.C., organization that “exists to predict, prevent, stop, and punish genocide and other forms of mass murder,” including in Sudan. Its board of advisers includes academics from around the country.

United to End Genocide began as the Genocide Intervention Network at Swarthmore College in 2005 as a way to raise money to help resolve the Darfur crisis. It has developed into a network of campus groups across the country. It is now based in Washington, D.C.

The Save Darfur Coalition is an alliance of more than 170 faith, advocacy and humanitarian organizations, representing all the major religions and dozens of Jewish, Muslim and Christian groups. It advocates for public awareness and public policy change and provides aid. It is now part of the United to End Genocide coalition.

Tony Ladd is athletic director at Trinity International University and co-author of Muscular Christianity: Evangelical Protestants and the Development of American Sport (Baker Books, 1999).