Łódź Ghetto
Jews and Roma were subjected to genocide as "undesirable" racial groups in the Holocaust. The Nazis established ghettos to confine Jews and sometimes Romas into tightly packed areas of the cities of Eastern Europe, turning them into "de facto" concentration camps. The Warsaw Ghetto was the largest of these ghettos, with 400,000 people. The Łódź Ghetto was the second largest, holding about 160,000.