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As a leader of Yiddish-speaking Orthodox Jewry, R. Rosenberg was active in the Union of Orthodox Rabbis of the United States and Canada, serving as chairman of its presidium (192628, 194056), president (192830), and honorary president (193039). He represented that organization as a member of a five-man commission that met with President Roosevelt in 1942 and received his assurance that Nazis guilty of perpetrating crimes on Jews would be punished.