Term for the underground archive established in 1940 in the Warsaw ghetto. The aim of the group, which was started by the Polish-Jewish historian Emanuel Ringelblum (1900–1944), was the documentation of Jewish life in German-occupied Poland. For camouflage, and because the archive’s executive committee convened for its weekly meeting every Saturday afternoon, the name chosen was Oyneg Shabbes, Yiddish for “joy of Shabbat.” Up to 60 people worked f…