Gisi Fleischmann (1894 – 18 October 1944) was a leader of the best known Holocaust era Jewish rescue group: the Bratislava Working Group. Mrs. Fleischmann was murdered in the Auschwitz concentration camp. The Working Group's co-leader was Rabbi Michael Ber Weissmandl. Thanks to the efforts of the Working Group, which bribed German and Slovakian officials and paid negotiated ransom to the Germans, the mass deportation of Slovakian Jews was delayed for two years, from 1942 to 1944.