Hapoel Hatzair
By the end of the 1920s, Ahdut HaAvoda, with the help of David Ben-Gurion, had won control of the Histadrut. Economic troubles at the end of the 1920s caused the Histadrut to apply intense pressure to Jewish companies which employed Arabs. Many Jews viewed this as a threat to their livelihood. The Histadrut thus faced opposition and Ben-Gurion saw that a united Histadrut would be more powerful against opposition. He thus united Ahdut HaAvoda and Hapoel Hatzair in December 1930 to create the Mapai party, bringing an end to Hapoel Hatzair. One of the Hapoel Hatzair leaders who joined the senior levels of Mapai was Haim Arlosoroff.