In the middle of 1942, Jan Karski, who had been serving as a courier between the Polish underground and the Polish government in exile, was smuggled into the Warsaw Ghetto. One of his guides in the ghetto was Leon Feiner who, like Zygielbojm, was a Bundist. Karski asked Feiner what prominent American and British Jews should do. "Tell the Jewish leaders," Feiner said, "that ... they must find the strength and courage to make sacrifices no other statesmen have ever had to make, sacrifices as painful as the fate of my dying people, and as unique."