Irgun

ארגון‎ "Irgun" or "Etzel"
Irgun emblem. The map shows both Mandatory Palestine and the Emirate of Transjordan, which the Irgun claimed in its entirety for a future Jewish state. The acronym "Etzel" is written above the map, and "raq kach" ("only thus") is written below.
Active	1931–1948
Country	Yishuv, Mandatory Palestine Israel
Type	Paramilitary (pre-independence) Unified armed forces (post-independence)
Disbanded	11 June 1948
Commanders
Notable commanders	Ze'ev Jabotinsky, Avraham Tehomi, Menachem Begin

The Irgun (Hebrew: ארגון‎‎; full title: הארגון הצבאי הלאומי בארץ ישראל Hā-ʾIrgun Ha-Tzvaʾī Ha-Leūmī b-Ērētz Yiśrāʾel, lit. "The National Military Organization in the Land of Israel") was a Zionist paramilitary organization that operated in Mandate Palestine between 1931 and 1948. It was an offshoot of the older and larger Jewish paramilitary organization Haganah (Hebrew: "Defense", הגנה). When the group broke from the Haganah it became known as the Haganah Bet (Hebrew: literally "Defense 'B' " or "Second Defense", הגנה ב), or alternatively as haHaganah haLeumit (ההגנה הלאומית) or Hama'amad (המעמד‎). Irgun members were absorbed into the Israel Defense Forces at the start of the 1948 Arab–Israeli war. The Irgun is also referred to as Etzel (אצ"ל), an acronym of the Hebrew initials, or by the abbreviation IZL.

The Irgun policy was based on what was then called Revisionist Zionism founded by Ze'ev Jabotinsky. According to Howard Sachar, "The policy of the new organization was based squarely on Jabotinsky's teachings: every Jew had the right to enter Palestine; only active retaliation would deter the Arabs; only Jewish armed force would ensure the Jewish state".

Two of the operations for which the Irgun is best known are the bombing of the King David Hotel in Jerusalem on 22 July 1946 and the Deir Yassin massacre, carried out together with Lehi on 9 April 1948.