Question: Whose poem was the name of these several groups of poets and musicians, which Umar Bin Hassan was associated with, from?

Context paragraphs:
Nasrullah Khan (Bukhara): Nasrullah Khan or Nasr-Allah bin Haydar Tora was the Emir of Bukhara (1827–1860).  His father was emir Haydar Tora (1800–1826).  After Haydar's death Hussain bin Haydar Tora came to power.  He died two months later and was succeeded by Umar bin Haydar Tora, who in 1827 was succeeded by Nasrullah.

Free Agent: A Spaced Odyssey: Free Agent: A Spaced Odyssey is the fifth solo album by former Parliament-Funkadelic keyboardist Bernie Worrell.  The album was released by Polystar Records in Japan in 1997.  The album features guest musicians Buckethead, Umar Bin Hassan and Bill Laswell.  "Free Agent" has never been distributed by any major or independent record label outside Japan.

Pieces of Woo: The Other Side: Pieces of Woo: The Other Side is the fourth solo album by former Parliament-Funkadelic keyboardist Bernie Worrell.  The album was released by CMP Records in Germany in 1993, and would be the only album that Bernie Worrell would record for the label.  The album tracks lean towards classic and experimental music.  "Pieces of Woo" features Fred Wesley, Buckethead and Umar Bin Hassan from the Last Poets.

Al Farooq Omar Bin Al Khattab Mosque: The Al Farooq Omar Bin Al Khattab Mosque & Centre (Arabic: مسجد ومركز الفاروق عمر بن الخطاب‎ ‎ ) is located in Dubai, United Arab Emirates.  The mosque is named after Umar bin Al Khattab, a companion of the Prophet Mohammed who became the second Caliph after Abu Bakr and was given the title Al Farooq, meaning someone who distinguished truth from falsehood.  The original Al Farooq Omar Bin Al Khattab Mosque was established on the same site in 1986.

The Last Poets: The Last Poets is the name for several groups of poets and musicians who arose from the late 1960s African-American civil rights movement's black nationalist movement.  The name is taken from a poem by the South African revolutionary poet Keorapetse Kgositsile, who believed he was in the last era of poetry before guns would take over.  The original users of that name were the trio of Felipe Luciano, Gylan Kain, and David Nelson.

And the Word Became Flesh: And the Word Became Flesh is the fifth album by emcee Professor Griff, which was released on September 11, 2001, on the Right Stuff Records and was produced by Professor Griff and Chuck D.  The album did not make it to any of the "Billboard" charts or produce any hit singles.  Chuck D, Umar Bin Hassan, and Kerwin "Sleek" Young made guest appearances.

Abu Abd al-Rahman Ibn Aqil al-Zahiri: Muhammad bin Umar bin Abd al-Rahman bin Abd Allah al-Aqil, better known as Abu Abd al-Rahman Ibn Aqil al-Zahiri, is a Saudi Arabian polymath.  He has, at various times, been referred to as a theologian, jurist, historian, ethnographer, geographer, poet, critic and author.  As a member of Saudi Arabia's "Golden Generation," he knew of life both during the poverty of the pre-oil boom era and the prosperity of the 1950s onward.

Ibn Dihya al-Kalby: Umar bin al-Hasan bin Ali bin Muhammad bin al-Jamil bin Farah bin Khalaf bin Qumis bin Mazlal bin Malal bin Badr bin Dihyah bin Farwah, better known as Ibn Dihya al-Kalbi (Arabic: ابن دحية الكلبي‎ ‎ ) was a Moorish scholar of both the Arabic language and Islamic studies, and member of the Ahl al-Bayt.  He preferred to be called Abu al-Khattab, though at various times he was also referred to as Ibn al-Jumayyil, Majd al-Din, Abu al-Fadl or simply Ibn Dihya.

Holy Terror (album): Holy Terror is the twelfth album by rap/spoken word pioneers The Last Poets released in 1993.  The album was financed and released by P-Vine Records in Japan and then released by Rykodisc Records in the United States and the United Kingdom later that same year, with a release in 2004 by Innerhythmic.  The U.S. and UK releases featured one bonus track entitled "Black and Strong (Homesick)".  The lead figures in the Last Poets at this time were Umar Bin Hassan and Abiodun Oyewole.  The album was part of the Black Arc Series, launched by producer Bill Laswell in 1992.

Umar Bin Hassan: Umar Bin Hassan (born in 1948) is an African-American poet associated with The Last Poets.  He sold his younger sister's record player to purchase a bus ticket to New York City, where he joined the Last Poets.  In the mid-1990s, he recorded a solo album titled "Be-Bop or be Dead" on Bill Laswell's Axiom Records through Island/PolyGram

Supporting paragraphs: Umar Bin Hassan The Last Poets
Answer: Keorapetse Kgositsile