Ахдут ха-Авода
The original Ahdut HaAvoda party was founded in Palestine in March 1919, while under British military administration, after a split in the Poale Zion party, which had established a branch in Ottoman Syria in 1906. Ahdut HaAvoda was led by David Ben-Gurion, who had been a member of the pre-war group. The root of the division was a conflict between membership of the Communist International and participation in the bourgeois Zionist Organisation (ZO). The membership of the more radical anti-ZO faction tended to come from among the newer Yiddish-speaking immigrants. The speaking of Yiddish became another area of disagreement with Ahdut HaAvoda having a Hebrew-only policy.