Group portrait of members of the Hashomer Hatzair socialist Zionist youth movement. Pictured in the back row, left to right, are: Tzvi Braun, Shifra Sokolka and Mordechai Anielewicz. Seated in front are Moshe Domb and Rachel Zilberberg ("Sarenka"). Warsaw, Poland, 1938. Photograph »

Zivia Lubetkin, a founder of the Jewish Fighting Organization (ZOB) and participant in the Warsaw ghetto uprising. Poland, date uncertain. Photograph »

Yitzhak (Antek) Zuckerman, Zionist youth leader and a founder of the Jewish Fighting Organization (ZOB). He fought in the Warsaw ghetto uprising. Place and date uncertain. Photograph »

Josef Kaplan, a leader of the Warsaw ghetto underground and Jewish Fighting Organization (ZOB). He was caught preparing forged documents and was killed. Poland, before September 1942. Photograph »

Portrait of Tosia Altman (1918-1943), member of the Jewish underground in the Warsaw ghetto. Photograph »

Cover of an underground Yiddish newspaper, "Jugend Shtimme" (Voice of Youth). Writing on the bottom of the cover reads: "Fascism must be smashed." Warsaw ghetto, Poland, January-February 1941. Photograph »