INS sent photographs to the Israeli government of the nine persons alleged by Hanusiak to have been involved in crimes against Jews: the government's agents asked survivors of Sobibor and Treblinka if they could identify Demjanjuk based on his visa application picture. While none recognized the name Ivan Demjanjuk, and no survivors of Sobibor identified his photograph, nine survivors of Treblinka identified Demjanjuk as "Ivan the Terrible", so named because of his cruelty as a guard operating the gas chamber at Treblinka. Lawyers at the US Office of Special Investigations (OSI), in the Department of Justice, valued the identifications made by these survivors, as they had interacted with and seen "Ivan the Terrible" over a protracted period of time. They also gained an additional identification of the visa photo as Demjanjuk by Otto Horn, a former SS guard at Treblinka.