Question: Abba Kovner  was a Jewish Hebrew and Yiddish poet, writer and cousin of the youngest and longest surviving signatory of what?

Passages:
Shalom-Shmuel Schwarzbard (Russian: Самуил Исаакович Шварцбурд , "Samuil Isaakovich Shvartsburd", Yiddish: שלום-שמואל שװאַרצבאָרד‎ , French: "Samuel (Sholem) Schwarzbard" ; 18 August 1886 – 3 March 1938) was a Russian-born French Yiddish poet of Jewish descent.  He served in the French and Soviet military, was an anarchist, and is known for the assassination of the Ukrainian national leader Symon Petliura.  He wrote poetry in Yiddish under the pen name of "Baal-Khaloymes" (English: The Dreamer ). Aliza Greenblatt (Yiddish: עליזה גרינבלאַט‎ , September 8, 1888 – September 21, 1975) was an American Yiddish poet.  Many of her poems, which were widely published in the Yiddish press, were also set to music and recorded by composers including Abraham Ellstein and Solomon Golub and were recorded by Theodore Bikel and Sidor Belarsky, among others.  Greenblatt published five volumes of Yiddish poetry and an autobiography in Yiddish, "Baym fentsṭer fun a lebn" (A Window on a Life Yiddish: ביים פענצטער פון א לעבן‎ ) and her works include such well-known Yiddish songs as "Fisherlid", "Amar Abaye", and "Du, Du".  She had five children, Herbert (1908), David (1914), Gertrude (1915), Marjorie (1917), and Bernard (1921).  Her daughter Marjorie, a dancer in the Martha Graham Dance Company, was for a time married to folk musician Woody Guthrie.  Greenblatt was the grandmother of folk musician Arlo Guthrie, Woody Guthrie archivist Nora Guthrie, and computer programmer Richard Greenblatt.  Greenblatt also helped found the Atlantic City, NJ chapters of the Zionist Organization of America, Hadassah and the Yidish Natsionaler Arbeter Farband, and was the president of the Women's Pioneers.  She was also involved with fundraising for the Jewish National Fund and Histadrut. Meir Vilner (Hebrew: מאיר וילנר‎ , born Ber Kovner; 23 October 1918 – 5 June 2003) was an Israeli communist politician and Jewish leader of the Communist Party of Israel (Maki), which consisted primarily of Israeli Arabs.  He was the youngest and longest surviving signatory of the Israeli Declaration of Independence in 1948.  Documents from East Germany that were discovred after the fall of the Soviet block, uncovered the fact the Vilner served as a foreign agent in the service of USSR.  This fact was ratified by the former head of the Mossad and the Shin Bet, Isser Harel, in an interview he had with Makor Rishon's editor, Chagai Segal. Vitka Kempner (14 March 1920–2012) was a Lithuanian Jewish partisan leader during World War II.  She served in the United Partisan Organization (Fareynikte Partizaner Organizatsye) and, alongside Rozka Korczak and founder Abba Kovner, assumed a leadership role in its successor group, the Avengers (Nokmim) — the only known undefeated ghetto uprising in the history of the Holocaust. Abba Kovner (Hebrew: אבא קובנר‎ ‎ ; March 14, 1918 – September 25, 1987) was a Jewish Hebrew and Yiddish poet, writer and partisan leader.  He became one of the great poets of modern Israel.  He was a cousin of the Israeli Communist Party leader Meir Vilner. Yoel Matveyev (יואל מאַטוועיעוו), born in 1976, is a New York-based Yiddish poet, writer and journalist from Leningrad, USSR.  He taught himself Yiddish at high school age and started writing Yiddish poetry as a teenager.  Matveyev's poems and verse translations of Russian poetry into Yiddish were published in the literary magazines "Der Nayer Fraynd", "Der Bavebter Yid", "Yugntruf" and "Di Tsukunft", read on the Israeli international radio Kol Israel and included in "Step By Step", a 2009 anthology of contemporary Yiddish poetry with parallel English translation. The Fareynikte Partizaner Organizatsye (Yiddish: פֿאַראײניקטע פּאַרטיזאַנער אָרגאַניזאַציע; "United Partisan Organization"; referred to as FPO by its Yiddish initials) was a Jewish resistance organization based in the Vilna Ghetto that organized armed resistance against the Nazis during World War II.  The clandestine organisation was established by Zionist as well as Communist partisans.  Their leaders were writer Abba Kovner and Yitzhak Wittenberg. The Nokmim (Hebrew: הנוקמים‎ ‎ ), also referred to as The Avengers or the Jewish Avengers, were a Jewish partisan militia, formed by Abba Kovner and his lieutenants Vitka Kempner and Rozka Korczak from the surviving remnants of the United Partisan Organization (Fareynikte Partizaner Organizatsye), which operated in Lithuania under Soviet command. Rozka Korczak (1921–1988) was a Lithuanian Jewish partisan leader during World War II.  She served in the United Partisan Organization (Fareynikte Partizaner Organizatsye) and, alongside Vitka Kempner and founder Abba Kovner, assumed a leadership role in its successor group, the Avengers (Nokmim)--the only known undefeated ghetto uprising in the history of the Holocaust. Abraham Sutzkever (Yiddish: אַבֿרהם סוצקעווער — "Avrom Sutskever"; Hebrew: אברהם סוצקבר; July 15, 1913 – January 20, 2010) was an acclaimed Yiddish poet. " The New York Times" wrote that Sutzkever was "the greatest poet of the Holocaust."

Supporting sentences:
 He was a cousin of the Israeli Communist Party leader Meir Vilner. Meir Vilner (Hebrew: מאיר וילנר‎ , born Ber Kovner; 23 October 1918 – 5 June 2003) was an Israeli communist politician and Jewish leader of the Communist Party of Israel (Maki), which consisted primarily of Israeli Arabs.  He was the youngest and longest surviving signatory of the Israeli Declaration of Independence in 1948.