A Polish Catholic nun cooperated with Polish nurse, humanitarian, and social worker who served in the Polish Underground in what war?
Irena Sendler: Irena Sendler (née Krzyżanowska ), also referred to as "Irena Sendlerowa" in Poland, "nom de guerre" "Jolanta" (15 February 1910 – 12 May 2008), was a Polish nurse, humanitarian, and social worker who served in the Polish Underground during World War II in German-occupied Warsaw, and was head of the children's section of Żegota, the Polish Council to Aid Jews (Polish: "Rada Pomocy Żydom" ), which was active from 1942 to 1945.
i don't know