With the disintegration of the Ottoman Empire and the establishment of British rule in Palestine, the nascent Zionist labor movement, shortly to become the backbone of the Zionist undertaking in Palestine, found itself confronted by a series of fundamental questions. The purpose of this paper is to show that there was never a consensus within the Zionist labor movement; that the leadership was divided on vital issues; that Israel's leader, David Ben-Gurion, represented only one approach within labor Zionism, and that even after his approach had prevailed, following drawn-out disputes, and he had risen to a position of commanding authority, his policies continued to be challenged by successive leaders during the decades preceding and following the establishment of the State of Israel.