The concentration camps were surrounded by barbed wire and forests to prevent escapes. Prisoners were divided - able bodied to work, elderly and children sent to gas chambers. They lived in cramped bunk beds and worked long hours doing manual labor or jobs related to the killings. Children were either killed upon arrival or used for forced labor and medical experiments. Prisoners were barely fed enough to survive on moldy bread and thin soup. Jews were forced to wear the Star of David and faced cruel treatment. While Jews were a primary target, others such as disabled people, Romani, homosexuals and political dissidents were also persecuted under Nazi rule. Around 200,000 Jews survived the Holocaust though many fought back through uprisings