The archive is named after Chaim Yisroel Eiss, a Jewish Rabbi[1] and activist who jointly set up the Ładoś Group.
During the war the group developed a system of illegal production of Latin American passports aimed at saving European Jews from The Holocaust.
[4] They were displayed in the Polish embassy in Switzerland in January 2019, and later were transferred to the Auschwitz-Birkenau State Museum in Poland.
[5] The collection includes eight forged Paraguayan passports as well as correspondence between persons to be rescued and Polish diplomats and Jewish organisations, photos of Jews seeking to obtain the documents, and a list of thousands of individuals, Polish Jews in ghettos in occupied Poland, who corresponded with the rescue activists.
[4][5] The documents in the Eiss archive helped establish that 330 people survived the Holocaust due to the actions of the Ładoś Group.