Abba Ahimeir (Hebrew: אב"א אחימאיר, 2 November 1897 - 6 June 1962) was a Russian-born Jewish journalist, historian and political activist. One of the ideologues of Revisionist Zionism, he was the founder of the Revisionist Maximalist faction of the Zionist Revisionist Movement (ZRM) and of the clandestine Brit HaBirionim.
Abba Shaul Geisinovich (later Abba Ahimeir) was born in Dolgi, a village near Babruysk in the Russian Empire (today in Belarus). From 1912-1914, he attended the Herzliya Gymnasium high school in Tel Aviv. While with his family in Babruysk for summer vacation in 1914, World War I broke out and he was forced to complete his studies in Russia. In 1917, he participated in the Russian Zionist Conference in Petrograd and underwent agricultural training as part of Joseph Trumpeldor’s HeHalutz movement in Batum, Caucasia to prepare him for a life as a pioneer in the Land of Israel. In 1920, he left Russia and changed his name from Gaisinovich to Ahimeir (in Hebrew: Meir’s brother) in memory of his brother Meir who had fallen in battle that year fighting against Poles during a pogrom.
Ahimeir studied philosophy at the Liège University in Belgium and at the University of Vienna, completing his PhD thesis on Oswald Spengler's The Decline of the West in 1924 just before immigrating to the British Mandate of Palestine. Upon his arrival in the country, Ahimeir became active in the Labor Zionist movements Ahdut HaAvoda and Hapoel Hatzair. For four years, he served as librarian for the cultural committee of the General Workers Organization in Zikhron Ya'akov and as a teacher in Nahalal and Kibutz Geva. During these years he regularly published articles in Haaretz and Davar, where he began to criticize the political situation in Palestine and of Zionism, as well as of the workers’ movement to which he belonged.
Political activism 
In 1928, Ahimeir, along with Yehoshua Yevin and famed Hebrew poet Uri Zvi Grinberg, became disillusioned with what they viewed to be the passivity of Labor Zionism and founded the Revisionist Labor Bloc as part of Ze’ev Jabotinsky’s Revisionist Zionist Movement. Ahimeir and his group were regarded by Revisionist Movement leaders as an implant from the Left whose political Maximalism and revolutionary brand of nationalism often made the Revisionist old guard uncomfortable.
Brit HaBirionim was the first Jewish organization to call the British authorities in Palestine a “foreign regime” and refer to the British Mandate over Palestine as “an occupation.” The group initiated a series of protest activities against British rule, the first of these took place on October 9, 1930 and was directed against the British Under-Secretary of State for the Colonies, Drummond Shiels, when he was on a visit to Tel-Aviv. This was the first sign of rebellion in Palestine’s Jewish community against the British and the first time that Ahimeir was arrested in the country.
In 1933, Brit HaBirionim turned its activities against Nazi Germany. In May of that year, Ahimeir led his followers in a campaign to remove swastikas from the flagpoles of the German consulates in Jerusalem and Jaffa. Brit HaBirionim also organized a boycott of German goods. Brit Habirionim became fierce critics of the Haavara Agreement and of its chief negotiator, Haim Arlosoroff. When Arlosoroff was killed in on a Tel-Aviv beach in June 1933, Ahimeir and two friends were arrested and charged with inciting the murder. Ahimeir was cleared of the charge before the trial even began but remained in prison and began a hunger strike that continued for four days. He was convicted of organizing an illegal clandestine organization and remained incarcerated in the Jerusalem Central Prison until August 1935. His imprisonment put an end to Brit HaBirionim.
Upon his release, Ahimeir married Sonia née Astrachan and devoted himself to literary work and scholarship. His articles in the newspaper Hayarden led to his re-arrest at the end of 1937 and three months in the Acre Prison together with members of the Irgun Zvai Leumi and other prominent Revisionist activists.
Following the establishment of the State of Israel in 1948, Ahimeir became a member of the editorial board of the Herut party daily in Tel-Aviv, as well as a member of the editorial board of the Hebrew Encyclopedia in Jerusalem where he published (under the initials A. AH.) scores of important academic articles, mostly in the fields of history and Russian literature. Ahimeir died at the age of 65 of a sudden heart attack on the eve of June 6, 1962). His sons, Ya'akov and Yosef, both went on to become journalists.
Ahimeir regarding Zionism as a secular, territorial phenomenon. He was the first to speak of "revolutionary Zionism," and call for a revolt against the British administration in Palestine. His worldview generally placed the contemporary political situation into the context of Jewish history, specifically the Second Temple Period, often casting himself and his friends as anti-imperialist freedom fighters, the British administration as a modern incarnation of ancient Rome and the official Zionist leadership as Jewish collaborators. Ahimeir's views had a profound influence on the ideology of the Irgun and Lehi undergrounds who later initiated an urban guerrilla war against the British.
Although Ahimeir described himself as a fascist during the late 1920s and early 1930s, and wrote a series of eight articles in the Hebrew Doar HaYom newspaper in 1928 entitled "From the Notebook of a Fascist," few of his contemporaries took these leanings seriously. Ze’ev Jabotinsky, who consistently maintained that there was no room for Fascism within his Revisionist movement, dismissed Ahimeir’s rhetoric and argued that he and his Maximalist followers were merely playacting to make a point and were not serious in their professed Fascist beliefs.
In the October 7, 1932 edition of "Hazit Ha’am", Jabotinsky wrote:
Such men, even in the Maximalist and activist factions, number no more than two or three, and even with those two or three – pardon my frankness – it is mere phraseology, not a worldview. Even Mr. Ahimeir gives me the impression of a man who will show flexibility for the sake of educational goals… to this end he has borrowed some currently fashionable (and quite unnecessary) phrases, in which this daring idea clothes itself in several foreign cities."
Ahimeir’s fascist image during the 1920s was seized upon by author Christopher Hitchens in a 1998 article titled "The Iron Wall" to argue that fascism was the ideology guiding Benzion Netanyahu, a disciple of Ahimeir, and consequently his son, Israeli Prime Minister Binyamin Netanyahu. In an April 16, 2010 interview with the Jerusalem Post, Ahimeir’s son Yossi defended his father against accusations of Fascism, saying:
"Hitchens is a known anti-Israel writer who takes my father’s writing completely out of context. Fascism in 1928 can’t be viewed in the context of the 1930s. Of course he would not be a fascist in view of how it developed."
- Larsen, Stein Ugelvik (ed.). Fascism Outside of Europe. New York: Columbia University Press, 2001. ISBN 0-88033-988-8. p364.
- Kaplan, Eran. The Jewish Radical Right. University of Wisconsin Press, 2005. p15
- Dr. Aba Ahimeir: The man who turned the tide Beit Aba
- Shindler, Colin. The Triumph of Military Zionism: Nationalism and the Origins of the Israeli Right. I.B.Tauris, 2006. p156.
- The Assassination of Hayim Arlosoroff Jewish Virtual Library
- Golan, Zev. Free Jerusalem: Heroes, Heroines and Rogues Who Created the State of Israel, (Israel: Devora, 2003), pp. 49-53, 66-77.
- "Terrorism Experts". Archived from the original on 17 December 2007. Retrieved 2007-12-02.
- The New Hebrew Nation, Yaacov Shavit
- Shindler, Colin. The Triumph of Military Zionism: Nationalism and the Origins of the Israeli Right. I.B.Tauris, 2006. p154-175.
- Abba Ahimeir Save Israel
- The iron wall Salon
- Shindler, Colin. The Triumph of Military Zionism: Nationalism and the Origins of the Israeli Right. I.B.Tauris, 2006. p174.
- Streetwise: My Father, Abba – Jerusalem Post
- "Dr.Aba Ahimeir: The man who turned the tide" Beit Aba Museum in Israel
- "The iron wall", Christopher Hitchens on Ahimeir's relationship with the Netanyahu family
- "Abba Ahimeir" Save Israel website featuring English translations of articles of anti-British Jewish underground fighters