"Irgun Zvai Leumi, ( Hebrew: National Military Organization) byname Etzel, Jewish right-wing underground movement in Palestine, founded in 1931. At first supported by many nonsocialist Zionist parties, in opposition to the Haganah, it became in 1936 an instrument of the Revisionist Party, an extreme nationalist group that had seceded from the World Zionist Organization and whose policies called for the use of force, if necessary, to establish a Jewish state on both sides of the Jordan." from Encyclopædia Britannica.
Years of wrath, days of glory : memoirs from the Irgun by