Karski clandestinely surveyed conditions in the Warsaw Jewish Ghetto and even volunteered to be smuggled into the Belzic death camp to gather evidence of the Nazis extermination policies. In 1943. he was sent by the Polish governmentinexile to inform American officials about the situation in his native country. among the prominent individuals he met with was President Roosevelt. In fact. shortly after meeting with Karski. Roosevelt ordered the creation of the American Refugee Board. an organization whose main task was to protect Jewish escapees and place them in the United States. After the war. when Poland traded Nazi totalitarianism for Soviet totalitarianism. Karski moved to the United States.