“We have been demanding investigations and interventions in Sudan,” he said “We’re very upset that Kofi Annan has not used his political leadership to move member states of the United Nations to act.”

Darfur Peace and Development Organization President Suliman Giddo showed the crowd vivid color photographs of scarred Sudanese babies and other victims of abuse.

The Rev. Gloria White Hammond, co-founder of My Sister’s Keeper, an organization that aims to raise awareness and funds to combat the slave trade in Sudan, introduced the speakers.

“I have been to Sudan. I have heard stories of women who have been brutally raped,” she said, standing on a makeshift stage. “We are here to say no more...tonight we say to Kofi Annan, ‘The buck stops with you, Kofi. No more rape. No more pillage. No more genocide.’”

Francis Bok, one of the speakers and a former slave who escaped after 10 years in captivity, now travels America galvanizing support for the abolitionist movement.

“[Annan] is the man who let my people down,” Bok said.

—Staff writer Hana R. Alberts can be reached at alberts@fas.harvard.edu. —Staff writer Timothy J. McGinn can be reached at mcginn@fas.harvard.edu.