Congregation Or Atid, a Conservative synagogue in Richmond, Va. conducts a “Switch Day,” when members take the shifts of Christian volunteers at nearby Beth Sholom Nursing Home.

Since 1990, Cedar Village, a retirement and nursing home in Mason, Ohio, has held a “Mitzvah Day” every Dec. 25, in which Jewish staff members volunteer to work for Christian staffers. Contact Rachel Festenstein, director of marketing and community outreach.

American Jewish World Service “works to realize human rights and end poverty in the developing world.” AJWS founded the Save Darfur Coalition, an alliance of more than 170 faith-based, advocacy and humanitarian organizations.

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.