|Date of birth||24 November 1879|
|Place of birth||Warsaw, Russian Empire|
|Year of aliyah||1933|
|Date of death||7 September 1970(aged 90)|
|Place of death||Gan Shmuel, Israel|
|1948–1949||Minister of Internal Affairs|
Yitzhak Gruenbaum (Polish: Izaak Grünbaum, Hebrew and Yiddish: יצחק גרינבוים, born 1879 died 1970) was a noted leader of the Zionist movement among Polish Jewry between the two world wars and of the Yishuv in Mandatory Palestine, and the first Interior Minister of Israel.
Education and journalistic career 
Gruenbaum was born in Warsaw, Poland. While a student of jurisprudence, he began activities on behalf of the Zionist movement and engaged in journalism. He served as editor of several periodicals widely circulated among Polish Jewry, including the Hebrew Ha-Zefirah and the Hebrew weekly Ha-Olam. Under his editorship, the Yiddish daily, Haynt, took on a pro-Zionist slant.
Political career in Poland 
On the political scene in Poland, Gruenbaum headed the Al Hamishmar radical Zionist faction. In 1919 he was elected to the Sejm (Polish parliament), where, together with Apolinary Hartglas, he organized a "Jewish bloc" that united most of the Jewish parties. He was the moving force in forming a collaboration with other minority parties represented in the Sejm, including Germans, Ukrainians, and others, to form a Bloc of National Minorities alliance in 1922, that acted to protect the rights of minority populations in Poland. His efforts brought about an increase of Jewish representation in the Sejm, which was accompanied by a rise in antisemitism. Gruenbaum was known for his courageous and militant stance against antisemitism and on behalf of minorities' rights, while equally critical of the ultra-orthodox party Agudat Israel and Jewish lobbying.
In Mandate Palestine and during the Holocaust 
During the Holocaust, he served on the "Committee of Four" chosen at the outbreak of World War II to maintain contact with Polish Jewry and aid in their rescue. In 1942, when word reached the Yishuv of the mass extermination taking place in Eastern Europe, Gruenbaum was chosen to head a 12-member Rescue Committee comprising representatives of the various parties. Due to circumstances prevailing at the time, their rescue efforts failed to accomplish much.
At the war's end, he endured a personal crisis involving his son, Eliezer Gruenbaum. The latter, a Holocaust survivor, was accused in Paris by two other Jewish Holocaust survivors of having served as a Kapo and acting cruelty towards Jewish prisoners. During his son's detention and trial, Gruenbaum remained at his side. The matter was eventually closed; not long afterwards, Eliezer Gruenbaum fell in the 1948 Arab-Israeli War.
In Israel 
Gruenbaum was among a group of 13 leaders forming the provisional government of the emerging State, and, as a member of Moetzet HaAm, signed its declaration of independence. Between 1948 and 1949 he served as a member of the Provisional State Council and was the first Minister of the Interior in that formative period. His initial stance was with the General Zionists, but as time went on moved leftward. He became an adherent of the Mapam socialist-Zionist party, and was known as a declared secularist. Gruenbaum headed an independent list in the elections for the first Knesset, but failed to obtain the minimum number of votes to secure a seat.
He was later a candidate for President in the 1952 presidential election alongside Yitzhak Ben-Zvi of Mapai, Peretz Bernstein of the General Zionists and Mordechai Nurock of Mizrachi. However, he was well beaten by Ben-Zvi.
Post-political career 
Following his exit from politics, Yitzhak Gruenbaum undertook the editing of an Encyclopaedia of the Diaspora Communities and numerous other volumes, including The Zionist Movement and its Development. He spent his later years on kibbutz Gan Shmuel, and died in 1970. The Alonei Yitzhak educational institution is named for him.
Further reading 
- Encyclopaedia Judaica, vol. 7, pp. 943–944.
- The Central Zionist Archives in Jerusalem site. Office of Yitzhak Gruenbaum (S46), personal papers (A127)
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- Yitzhak Gruenbaum on the Knesset website