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In 1903, he participated in the Sixth Zionist Congress, where he was elected to the Committee for the Study of Eretz Israel, along with Otto Warburg and Franz Oppenheimer.
Gusti represented the Reform Movement at the World Zionist Congress, and was elected to the World Zionist Organization Executive at the 36th World Zionist Congress, as the co-chair of the Department for Zionist Activities in the Diaspora in 2010.