Hapoel Hatzair
In 1920, Yehuda travelled to Europe to help immigrants of the Third Aliyah. The following year he helped found Nahalal, the first moshav ovdim, and was a director of the Moshav fund and a member of the Moshavim Movement's secretariat, as well as the Farmers Federation and Histadrut trade union. He helped establish Hapoel Hatzair movement, and was a member of its central committee. He also helped establish Hapoel Hatzair and Tzeiri Zion in the United States.