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In 1944 he became the secretary of the Hashomer Hatzair Workers Party and the Socialist League in Haifa.
He was amongst the founders of the Socialist League in 1936, and was a member of the Assembly of Representatives.
The SDI was founded in 1998 by the merger of the Italian Socialists (Enrico Boselli, Roberto Villetti and Ottaviano Del Turco), the Italian Democratic Socialist Party (Gian Franco Schietroma and Giorgio Carta), a portion of the Labour Federation, a portion of the Socialist Party (Ugo Intini) and the Socialist League (Claudio Martelli and Bobo Craxi).
He was amongst the founders of the Marxist Studies Group and the Socialist League, and was an activist for the Hashomer Hatzair Workers Party and later Mapam.
In 1888 he moved to Melbourne and established the local branch of the Australian Socialist League; on 20 July 1889 he formed the Social Democratic League with William Maloney and W. D. Flinn, publishing a pamphlet, Social Democracy, in 1890.