 Although the agreement did not stipulate different treatment for Poles who were ethnically Jewish , many Jews feared that the agreement would not be honored in their case . In fact , the Nazis conducted a " medical examination " at the Pruszków internment camp , in order to " catch out " Jews from among Warsaw 's refugees . As a consequence , a large number of the Jews who were still in Warsaw at the time of the uprising , decided to remain in hiding rather than join the non @-@ Jewish civilians leaving the city . According to memoirs from the period , the choice often came down to whether a particular person " looked Aryan " and could pass for a non @-@ Jewish Pole . 
