Even before the Holocaust, the Jews of Europe and North Africa had established welfare and mutual aid organizations. Following the occupation, the Nazis dismantled these organizations, but the Jews re-established them clandestinely in communities, ghettos, concentration camps and even in the forests, while fighting with the partisans.
Bucharest, Romania, 1942-1944, Children who have received clothes from self-help organizations
Yad Vashem Archives 105BO7
Warsaw, Poland, Jews around a seder table in a shelter on 6 Leszno St. in the ghetto, reading from the Passover Haggada