"Ya'akov (Vitkin) Zerubavel was a Jewish Zionist activist, writer, publisher, and one of the leaders of the Poale Zion movement."@en . . . "Zerubavel, Yaakov"@en . . "Ukrainian activist" . "Ya'akov Zrubavel"@en . . . "Jacob Vitkin, Jacob Zerubavel"@en . "1967-06-02Z"^^ . "1886-01-14Z"^^ . . "1886Z"^^ . . "1967Z"^^ .