Boruch Spiegel, one of the last surviving fighters of the Warsaw ghetto uprising of 1943, in which a vastly outgunned band of 750 young Jews held off German soldiers for more than a month with crude arms and Molotov cocktails, died on May 9 in Montreal. He was 93.

His death was confirmed by his son, Julius, a retired parks commissioner of Brooklyn. Mr. Spiegel lived in Montreal.

The Warsaw ghetto uprising has been regarded as the signal episode of resistance to the Nazi plan to exterminate the Jews. The United States Holocaust Memorial Museum calls it the first armed urban rebellion in German-occupied Europe.

As a young man, Mr. Spiegel was active in the leftist Jewish Labor Bund, and when it became clear that the Germans were not just deporting Jews but systematically killing them in death camps like Treblinka, Bundists joined with other left-wing groups to form the Jewish Combat Organization, known by its Polish acronym ZOB....