Question: What is the name of the national movement of the Jewish people did Samuel Gruber "aka" Mieczyslaw Gruber belong to?

Context paragraphs:
Mieczyslaw Gruber: Samuel Gruber "aka" Mieczyslaw Gruber (January 3, 1913 – June 17, 2006) was born in Podhajce, Poland (now Pidhaitsi, Ukraine).  As a youth, Gruber belonged to the Zionist organizations Ha-Shomer ha-Tza'ir and He-halutz.  When he was 14, Gruber went to Lwów, Poland (now Lviv, Ukraine) to attend high school.  After graduation, Gruber remained in Lwów for about two years.  He then returned to Podhajce where he worked as a bookkeeper for a company that manufactured farm equipment and bicycles.

Jewish left: The term "Jewish left" describes Jews who identify with or support left wing, occasionally liberal causes, consciously as Jews, either as individuals or through organizations.  There is no one organization or movement which constitutes the "Jewish left," however.  Jews have been major forces in the history of the labor movement, the settlement house movement, the women's rights movement, anti-racist work, and anti-fascist organizing of many forms in Europe, the United States and modern-day Israel.  The Jewish people have a rich history of involvement in socialism, Marxism, and Western liberalism.  Although the expression "on the left" covers a range of politics, many well-known figures "on the left" have been of Jews who were born into Jewish families and have various degrees of connection to Jewish communities, Jewish culture, Jewish tradition or the Jewish religion in its many variants.

The Songs of the Jewish Shtetle: The Songs of the Jewish Shtetle is a cultural musical project aimed at preserving the Jewish cultural heritage.  The project has gathered songs in Yiddish, a language put on the Red List of Threatened Languages by UNESCO.  Before World War II the number of native Yiddish speakers amounted to 11 million people.  During Holocaust 6 million Jewish people were killed, thus the number of Yiddish speakers halved.  The language continued in literature, oral speech, Ashkenazi folklore, and in songs.  These songs reflect habits and ways, language and music, the soul of the Jewish people.  The attitude to parents, children, neighbours, religion, work, native home, the world around and themselves, to life and death – all this is expressed in the art of singing, and each of the Songs of Jewish Shtetle becomes a little music play.  The project is unique as the Jewish songs in Yiddish, which had been persecuted for centuries, the songs that had only been played by small klezmer ensembles before, were for the first time performed with all the vivacity of a big symphony orchestra.

Libyan National Movement: The Libyan National Movement (Arabic: الحركة الوطنية الليبية‎ ‎ , "al-Ḥarakah al-Waṭanīyah al-Lībīyah ") is a Libyan political organization.  The Libyan National Movement was established in December 1980, by opponents of Muammar Gaddafi's government.  The founder of the organization was the Ba'athist lawyer 'Umran Burweiss.  Muftah Lamlum is the general secretary of the Libyan National Movement.  Politically, the Libyan National Movement has a left-wing nationalist and Ba'athist orientation.  The organization operates in exile, primarily amongst Libyans in Europe, during the mid-1980s it was active amongst students abroad.  The publication of the organization was called "Sawt at-Talia" ('Voice of the Vanguard').  The magazine was later discontinued and substituted by a website.

The Invention of the Jewish People: The Invention of the Jewish People (Hebrew: "מתי ואיך הומצא העם היהודי?" ‎ ‎ , "Matai ve’ech humtza ha’am hayehudi?" , literally "When and How Was the Jewish People Invented?")  is a study of the historiography of the Jewish people by Shlomo Sand, Professor of History at Tel Aviv University.  It has generated a heated controversy.

Jewish People Policy Institute: The Jewish People Policy Institute (JPPI; Hebrew: המכון למדיניות העם היהודי‎ ‎ ; formerly: The Jewish People Policy Planning (JPPPI)), is a Non-profit organization with the purpose of promoting and securing the Jewish people and Israel.  The institute is a professional policy planning apparatus and a strategic thought process for the Jewish people in the most fundamental subjects concerning the Jewish people.  The institute is served by most prominent public figures from the government, academia, the private sector in Israel and Jewish communities around the world, who constitute the think tank of this body.

National Movement (Georgia): National Movement (Georgian: ნაციონალური მოძრაობა , "Natsionaluri Modzraoba", NM) is the center-right party and the opposition party in Georgia.  The party was founded on 12 January 2017 after dissolvement of its merger United National Movement, this party was merged into two parties, European Georgia, led by Davit Bakradze, former Mayor of Tbilisi Gigi Ugulava and their supporters after 4 month party conflict.  Members of United National Movement stayed in party, including former president of Georgia Mikheil Saakashvili, but after dissolvement they have party named National Movement.

Zionism: Zionism (Hebrew: צִיּוֹנוּת‎ "Tsiyyonut" ] after "Zion") is the national movement of the Jewish people that supports the re-establishment of a Jewish homeland in the territory defined as the historic Land of Israel (roughly corresponding to Canaan, the Holy Land, or the region of Palestine).  Modern Zionism emerged in the late 19th century in Central and Eastern Europe as a national revival movement, in reaction to anti-Semitic and exclusionary nationalist movements in Europe.  Soon after this, most leaders of the movement associated the main goal with creating the desired state in Palestine, then an area controlled by the Ottoman Empire.

Homeland for the Jewish people: A homeland for the Jewish people is an idea rooted in Jewish culture and religion.  In the early 19th century, the Napoleonic Wars led to the idea of Jewish emancipation.  This unleashed a number of religious and secular cultural streams and political philosophies among the Jews in Europe, covering everything from Marxism to Chassidism.  Among these movements was Zionism as promoted by Theodore Herzl.  In the late 19th century, Herzl set out his vision of a Jewish state and homeland for the Jewish people in his book "Der Judenstaat".  Herzl was later hailed by the Zionist political parties as the founding father of the State of Israel.  In the Balfour Declaration of 1917, the United Kingdom became the first world power to endorse the establishment in Palestine of a "national home for the Jewish people."  The British government confirmed this commitment by accepting the British Mandate for Palestine in 1922 (along with their colonial control of the Pirate Coast, Southern Coast of Persia, Iraq and from 1922 a separate area called Transjordan, all of the Middle-Eastern territory except the French territory).  The European powers mandated the creation of a Jewish homeland at the San Remo conference of 19–26 April 1920.  In 1948, the State of Israel was established.

Golus nationalism: Golus nationalism (Yiddish: גלות נאַציאָנאַליזם "Golus natsionalizm" after golus), or Diaspora Nationalism, is a national movement of the Jewish people that argued for furthering Jewish national and cultural life in the large Jewish centers throughout the world, while at the same time seeking recognition for a Jewish national identity from world powers.

Supporting paragraphs: Mieczyslaw Gruber Zionism
Answer: Zionism