Question: Mansur al-Atrash, was a Syrian politician and journalist, during the period of the United Arab Republic (1958–61), Atrash became a strong supporter of Egyptian president and which pan-Arab leader, who was the second President of Egypt, serving from 1956 until his death?

full_context: Document 1: Mansur al-Atrash: Mansur al-Atrash (Arabic: منصور الأطرش‎ ‎ ; 3 February 1925 – 14 November 2006) was a Syrian politician and journalist. Together with fellow university students, Atrash became a founding member of the Ba'ath Party and its Syrian regional branch in 1947. During the presidency of Adib Shishakli (1951–54), he became an anti-government activist and was imprisoned twice, only to be released in an unsuccessful attempt by Shishakli to gain the support of Atrash's father, Sultan. In the year Shishakli was overthrown, Atrash was elected to parliament and turned down an offer to serve in Said al-Ghazzi's government. During the period of the United Arab Republic (1958–61), Atrash became a strong supporter of Egyptian president and pan-Arab leader Gamal Abdel Nasser. He opposed Syria's secession from the UAR and turned down offers to serve in successive separatist governments in protest.
Document 2: Hosni Mubarak: Muhammad Hosni El Sayed Mubarak (Arabic: محمد حسني السيد مبارك‎ ‎ , ] , "Muḥammad Ḥusnī Sayyid Mubārak "; born 4 May 1928) is a former Egyptian military and political leader who served as the fourth President of Egypt from 1981 to 2011.
Document 3: Gamal Abdel Nasser: Gamal Abdel Nasser Hussein (Arabic: جمال عبد الناصر حسين‎ ‎ , ] ; 15 January 1918 – 28 September 1970) was the second President of Egypt, serving from 1956 until his death. Nasser led the 1952 overthrow of the monarchy and introduced far-reaching land reforms the following year. Following a 1954 attempt on his life by a Muslim Brotherhood member, he cracked down on the organization, put President Muhammad Naguib under house arrest, and assumed executive office, officially becoming president in June 1956.
Document 4: Haytham Manna: Haytham Manna (al-Awdat) is a Syrian writer; he spent three decades as a human rights activist who helped create and became spokesperson for the Arab Commission for Human Rights (ACHR). In 2011, during the early stages of the Syrian civil war, he resigned as spokesperson of the ACHR and helped create and become spokesperson of the National Coordination Committee for Democratic Change (NCC), one of the two main opposition groups active in the uprising that became a civil war. Manna lives in Paris. In 2015, he was elected co-chairperson of the Syrian Democratic Council, the newly founded umbrella organisation of secular, democratic, non-Islamist opposition in Syria.
Document 5: Akram al-Hawrani: Akram Al-Hourani (Arabic: أكرم الحوراني‎ ‎ , also transcribed El-Hourani, Howrani or Hurani) (1912 – February 24, 1996), was a Syrian politician who played a prominent role in the formation of a widespread populist, nationalist movement in Syria and in the rise of the Ba'ath Party. He was highly influential in Syrian politics from the beginning of the 1940s until his departure into exile in 1963. Al-Hourani held various positions including a government ministry and the joint vice-presidency of the United Arab Republic.
Document 6: Ba'ath Party (Syrian-dominated faction): The Arab Socialist Ba'ath Party (also spelled Baath, meaning "resurrection" or "renaissance"; Arabic: حزب البعث العربي الاشتراكي‎ ‎ "Hizb Al-Ba'ath Al-'Arabi Al-Ishtiraki"), also referred to as the pro-Syrian Ba'ath movement, is a neo-Ba'athist political party, with branches across the Arab world. The party emerged from a split in the Ba'ath Party in February 1966. The party leads the government in Syria. From 1970 until 2000, the party was led by the Syrian president Hafez al-Assad. s of 2000 , leadership has been shared between his son Bashar al-Assad (head of the Syrian regional organization) and Abdullah al-Ahmar (head of the pan-Arab national organization). The Syrian branch of the party is the largest organisation within the Syrian-led Ba'ath Party.
Document 7: Hafez al-Assad: Hafez al-Assad (Arabic: حافظ الأسد‎ ‎ "Ḥāfiẓ al-ʾAsad ", ] ] ; 6 October 1930 – 10 June 2000) was a Syrian statesman, politician, and general who was President of Syria from 1971 to 2000. He was also Prime Minister from 1970 to 1971, as well as Regional Secretary of the Regional Command of the Syrian Regional Branch of the Arab Socialist Ba'ath Party and Secretary General of the National Command of the Ba'ath Party from 1970 to 2000.
Document 8: Bashir Barghouti: Bashir Barghuthi (Arabic: بشير البرغوثي‎ ‎ , 1931–2000) was a Palestinian Communist leader and journalist. Barghouti was born in the village of Dayr Ghassana in the Ramallah Governorate. He earned a BA degree in Economics from the American University in Cairo in 1956. Living in exile in Jordan, he founded the central organ of the Jordanian Communist Party "al-Jamahir" (The Masses) and joined the General Union of Palestinian Students (GUPS). In 1957 the paper was closed by Jordanian authorities, and Barghouti was incarcerated the Al-Jaffar prison. When freed in 1965, he was refused a journalist license by the Jordanian government, but continued to write under an assumed name. After 1967 he opposed the right of king Hussein of Jordan to speak on behalf of Palestinians.
Document 9: History of Egypt under Gamal Abdel Nasser: The history of Egypt under Gamal Abdel Nasser covers the period of Egyptian history from the Egyptian Revolution of 1952, of which Gamal Abdel Nasser was one of the two principal leaders, spanning Nasser's presidency of Egypt from 1956, to his death in 1970. Nasser's tenure as Egypt's leader heralded a new period of modernization, and socialist reform in Egypt, and a staunch advocacy of pan-Arab nationalism (including a short-lived union with Syria), and Developing World solidarity. His prestige in Egypt and throughout the Arab World soared in the wake of his nationalisation of the Suez Canal in 1956, and Egypt's political victory in the subsequent Tripartite Aggression, but was damaged badly by Israel's successful invasion and occupation of Egyptian and Arab territory in the Six-Day War of 1967.
Document 10: Mustafa Ahmed Hassan Hamza: Mustafa Hamza (born 1956) is an Egyptian commander of the military branch of the Islamic Group. He was sentenced to death in absentia by an Egyptian court in the Returnees from Afghanistan case. It is believed he took part in the 1981 assassination of Egyptian President Anwar El Sadat, the attempted assassination of President Hosni Mubarak in Addis Ababa in June 1995, and the Luxor massacre, which killed more than 60 tourists and Egyptians in 1997. He was in Iran until May 2004, when he was extradited to Egypt. He was pardoned in 2012. Also goes by the aliases Abu Hazem, Mohamed Gamal El-Sayed, Mohamed Gamal El-Sayed Ali Khalil.
Document 11: United Arab Republic: The United Arab Republic (UAR; Arabic: الجمهورية العربية المتحدة‎ ‎ "al-Jumhūrīyah al-'Arabīyah al-Muttaḥidah ") was a state, and between 1958 and 1961, a short-lived political union between Egypt and Syria. The union began in 1958 and existed until 1961, when Syria seceded from the union after the 1961 Syrian coup d'état. In 1971 the UAR was renamed the Arab Republic of Egypt. The president was Gamal Abdel Nasser. The UAR was a member of the United Arab States, a loose confederation with North Yemen, which was dissolved in 1961.
Document 12: Abdel Latif Boghdadi (politician): Abdel Latif Boghdadi or Abd el-Latif el-Baghdadi (20 September 1917 – 9 September 1999) (Arabic: عبد اللطيف البغدادي‎ ‎ ) was an Egyptian politician, senior air force officer, and judge. An original member of the Free Officers Movement which overthrew the monarchy in Egypt in the 1952 Revolution, Boghdadi later served as Gamal Abdel Nasser's vice president. The French author Jean Lacouture called Boghdadi "a robust manager" who only lacked "stature comparable to Nasser's." The two leaders had a fallout over Nasser's increasingly socialist and pro-USSR policies and Boghdadi subsequently withdrew from political life in 1964, although he mended ties with Nasser before the latter's death in 1970.
Document 13: Nasser al-Bahri: Nasser al-Bahri (1972 – December 26, 2015), also known by his "kunya" or "nom de guerre" as Abu Jandal – "father of death", was a member of al-Qaeda in Afghanistan from 1996 to 2000. He gave his bayat (secret oath of allegiance) to Osama bin Laden in 1998, an experience he describes in detail in his memoir. He was in al-Qaeda for four years, first as one of bin Laden's twelve bodyguards, and then as head of Osama bin Laden's security detail. A citizen of Yemen born in Saudi Arabia, Al-Bahri was radicalized in his teens by dissident Saudi Ulemas and participated in clandestine political activities which were funded in part by people trafficking. Having determined to become a jihadist he went first to Bosnia and then, briefly, to Somalia before arriving in Afghanistan in 1996 in the hope of joining Al-Qaeda, which he soon did. After four years, al-Bahri became "disillusioned", largely because bin Laden consolidated al-Qaeda's relationship with the Taliban by giving his bayat to its leader, Mullah Omar, but also because he had married and become a father.
Document 14: Egyptian revolution of 1952: The Egyptian revolution of 1952 (Arabic: ثورة 23 يوليو 1952‎ ‎ ), also known as the July 23 revolution, began on July 23, 1952, by the Free Officers Movement, a group of army officers led by Muhammad Naguib and Gamal Abdel Nasser. The revolution was initially aimed at overthrowing King Faruq. However, the movement had more political ambitions, and soon moved to abolish the constitutional monarchy and aristocracy of Egypt and Sudan, establish a republic, end the British occupation of the country, and secure the independence of Sudan (previously governed as an Anglo-Egyptian condominium). The revolutionary government adopted a staunchly nationalist, anti-imperialist agenda, which came to be expressed chiefly through Arab nationalism, and international non-alignment.
Document 15: Hussein el-Shafei: Hussein Mahmoud Hassan el-Shafei, (Arabic: حسين محمود حسن الشافعي‎ ‎ ), also known as Hussein el-Shafei (8 February 1918 – 18 November 2005), was a member of Egypt's 1952 revolutionary leadership council and served as Vice-president under two Egyptian presidents, Gamal Abdel Nasser and Anwar Sadat. He was one of the nine men who had constituted themselves as the committee of the Free Officers Movement, led the country's cavalry corps during the uprising and was one of only three living members of the Revolutionary Command Council at the time of his death.
ground_truth: Gamal Abdel Nasser Hussein