Berl Katznelson was one of the intellectual founders of Labor Zionism, instrumental to the establishment of the modern state of Israel, and the editor of Davar, the first daily newspaper of the workers' movement.

Labor Zionism or socialist Zionism refers to the left-wing, socialist variation of Zionism. For many years, it was the most significant tendency among Zionists and Zionist organizations, and was seen as the Zionist sector of the historic Jewish labour movements of Eastern Europe and Central Europe, eventually developing local units in most countries with sizable Jewish populations. Unlike the "political Zionist" tendency founded by Theodor Herzl and advocated by Chaim Weizmann, Labor Zionists did not believe that a Jewish state would be created by simply appealing to the international community or to powerful nations such as the United Kingdom, Germany, or the former Ottoman Empire. Rather, they believed that a Jewish state could only be created through the efforts of the Jewish working class making aliyah to the Land of Israel and raising a country through the creation of a Labor Jewish society with rural kibbutzim and moshavim, and an urban Jewish Proletariat.