Various Zionist organizations were represented in the American Emergency Committee of Zionist Affairs, which called an "Extraordinary Zionist Conference" as a substitute for the full (22nd) Zionist Congress which had been cancelled due to World War II. Attendees included Chaim Weizmann, as President of the World Zionist Organization, David Ben-Gurion as Chairman of the Jewish Agency Executive, and Nahum Goldmann as a member of the Executive of the Zionist Organization of America.[8] The four main organisations of American Jewry represented were: the Zionist Organization of America, Hadassah, Mizrahi, and Poale Zion.[citation needed] Among the American organizers was Reform Rabbi Abba Hillel Silver.[citation needed]