Sosa is a former Guatemalan military officer accused of having participated in the 1982 massacre at Dos Erres in 1982. Over 200 men, women and children were killed during this massacre.
The Open Society Foundation is hosting an event on September 26th that addresses Guatemala's past with the massacre at Dos Erres front and center.
- Óscar Ramírez, survivor of the 1982 Dos Erres massacre. He is seeking asylum in the United States and is also involved as a witness in prosecutions of egregious human rights violations in Guatemala.
- Fredy Peccerelli, executive director of the Guatemalan Forensic Anthropology Foundation (FAFG), has led the search for and exhumation of remains of many of the victims of atrocities, including those at Dos Erres.
- Kate Doyle, a senior analyst at the National Security Archive, an independent non-governmental research institute and library located at The George Washington University. Kate is the editor of a collection of declassified records entitled Death Squads, Guerrilla War, Covert Operations, and Genocide: Guatemala and the United States, 1954-1999, and uncovered classified U.S. government documents establishing that U.S. officials were aware that the Guatemalan Army may have committed a massacre at Dos Erres.
- Scott Greathead, a lawyer and human rights activist, is representing Óscar in his U.S. asylum claim and has been active in human rights work across Latin America for decades.