Aaron Samuel Liebermann (Hebrew: אַהֲרֹן שְׁמוּאֵל לִיבֶּרְמַן‎, Aharon Shmu'el Liberman; 20 May 1845 – 18 November 1880), also known by his pen names Bar Drora and Daniel Ish Ḥamudot and later as Arthur Freeman, was a socialist author, Hebrew translator, and political essayist. A pioneer of Jewish socialism and the Jewish labour movement, he was described by Rudolf Rocker and Ber Borochov as the "father of Jewish socialism".