Here is a screenshot of the Huffington Post article that ties Romney to death squads.
While they were on the lookout for investments in the United States, members of some of these prominent families — including the Salaverria, Poma, de Sola and Dueñas clans — were also at the time financing, either directly or through political parties, death squads in El Salvador. The ruling classes were deploying the death squads to beat back left-wing guerrillas and reformers during El Salvador’s civil war.
The death squads committed atrocities on such a mass scale for so small a country that their killing spree sparked international condemnation. From 1979 to 1992, some 75,000 people were killed in the Salvadoran civil war, according to the United Nations. In 1982, two years before Romney began raising money from the oligarchs, El Salvador’s independent Human Rights Commission reported that, of the 35,000 civilians killed, "most" died at the hands of death squads.