A gas van or gas wagon (, "dushegubka", literally "soul killer"; ) was a truck reequipped as a mobile gas chamber. During World War II and the Holocaust, Nazi Germany developed and used gas vans on a large scale as an extermination method to murder inmates of asylums, Poles, Romani people, Jews, and prisoners in occupied Poland, Belarus, Yugoslavia, the Soviet Union, and other regions of German-occupied Europe. During the Great Purge, Soviet NKVD used gas vans for killing prisoners.