By 1923, some 8,000 olim were arriving in Palestine every year. This period was known as the Third Aliyah. Many of the new arrivals were pioneers - young, single and with a socialist outlook on life, wanting to establish in Eretz Israel not only a Jewish state but a more just society. They founded settlement bodies, kibbutzim and moshavim, the most famous of them being the Gedud haAvoda (Labor Battalion), in honor of Joseph Trumpeldor, who was killed in battle when Arabs attacked Tel Hai in 1920. The World Zionist Organization supported them, and cooperative settlement, in those years, became the apple of its eye. At the same time, Dr. Chaim Weizmann, president of the World Zionist Organization, was also attempting to attract non-Zionists to Palestine; people of means from America whom he tried to recruit to the Zionist endeavor through a new body that he would establish - the Jewish Agency.