Question: The black revolutionary activist who murdered Gale Ann Benson was executed in what year?

Context paragraphs:
Hồ Tùng Mậu: Hồ Tùng Mậu (1896-1951) was a revolutionary activist and politician in Vietnam.  He was a member of both the Communist Party of China and the Communist Party of Vietnam, a member of the Central Central Committee of the Communist Party of Vietnam, the Inspector General of the Government Inspectorate.

Áine Ceannt: Áine Ceannt (née Ní Bhraonáin) (Dublin 1880-1954) was an Irish revolutionary activist and humanitarian leader.

Constitution House of Tabriz: The Constitution House of Tabriz, also known as Khaneh Mashrouteh, is a historical edifice located next to the Great Bazaar of Tabriz, on Motahari Ave in Tabriz, Iran.  During the years which led to Constitutional Revolution and afterwards the house was used as a gathering place of the leaders, activists and sympathizers of the movement.  Among them, the most famous people were Sattar khan, Bagher Khan, Seqat-ol-Eslam Tabrizi and Haji Mirza Aqa Farshi and the founder Haji Mehdi Kuzeh kanaani, himself a revolutionary activist and a well-reputed person of the time; who was named Abolmele, i.e. the father of the nation at the time.  .  The two-story building was constructed in 1868 by Haj Vali Me'mar-e Tabrizi.  It has numerous rooms and halls.  The most beautiful part of the house is a skylight and corridor decorated with colorful glass and mirrors.

Zayd Mutee' Dammaj: Dammaj was born in As Sayyani District of Ibb Governorate.  His father Sheikh Mutee' bin Abdullah Dammaj was a committed revolutionary activist against the rule of Imam Yahya and went on to establish a political party named Al-Ahrar in Aden in 1943.  Sheikh Mutee' continued his struggle against Imamate regime and became the first governor of Ibb Governorate after the revolution of 1962.  The young Dammaj was educated in the village madrasa and at home, before his father sent him to a school in Taiz.  In 1958, Dammaj went to Egypt where he studied in schools in Bani Suwayf and Tanta before enrolling in Cairo University in 1964.  He studied law for a couple of years before deciding to make the switch to journalism.  He had already started to write political articles and short fiction that was published in the New Yemen periodical.  In 1968, still in the middle of his studies, he was summoned back home to participate with his father in the anti-royalist movement.

Lovro Toman: Lovro Toman (10 August, 1827 – 15 August, 1870) was a Slovene Romantic nationalist revolutionary activist during the Revolution of 1848, known as the person who in Ljubljana, at the Wolf Street 8, raised the Slovene tricolor for the first time in history in response to a German flag raised on top of the Ljubljana Castle.  Later he helped founding one of the first Slovene publishing houses, the "Slovenska matica".  He was a Slovene national conservative politician and member of the Austrian Parliament.  Together with Janez Bleiweis and Etbin Henrik Costa, he was part of the leadership of the Old Slovene party.

Vladimir Burtsev: Vladimir L'vovich Burtsev (Russian: Владимир Львович Бурцев ; November 17, 1862August 21, 1942), was a revolutionary activist, scholar, publisher and editor of several Russian language periodicals.  He became famous by exposing a great number of agents provocateurs, notably Yevno Azef in 1908.  Because of his own revolutionary activities and his harsh criticism of the imperial regime, including personal criticism of emperor Nicholas II, he was imprisoned several times in various European countries.  In the course of his life, Burtsev fought oppressive policies from Tsarism in Imperial Russia, followed by the Bolsheviks and later Adolf Hitler's National Socialism.

Luo Zhi: Luo Zhi (; also Lo Zu) (1915 – 1949), born Luo Changsheng （罗长生）, was a revolutionary activist and leader in Xinjiang just prior to the incorporation of Xinjiang into the People’s Republic of China in 1949.

Michael X: Michael X (1933 – 16 May 1975), born Michael de Freitas in Trinidad and Tobago, was a self-styled black revolutionary and civil rights activist in 1960s London.  He was also known as Michael Abdul Malik and Abdul Malik.  Convicted of murder in 1972, Michael X was executed by hanging in 1975 in Port of Spain's Royal Jail.

Gale Benson: Gale Ann Benson (4 November 1944 – 2 January 1972) was a British model, socialite and daughter of Conservative MP Leonard Plugge.  She was buried alive and murdered in Trinidad by activist Michael X and members of his Black Power group.

Hyder Bux Jatoi: Hyder Bux Jatoi (1901-1970) was a revolutionary, leftist, peasant leader in Sindh, Pakistan.  He is known by his supporters as "Baba-e-Sindh" (Father of Sindh).  He was also a Sindhi writer and poet.  He was for many years the president of the Sindh Hari Committee (Sindh Peasants Committee), a constituent member of the National Awami Party.  The singer & revolutionary activist of Sindh Jiji Zareena Baloch was always quoted Comrade Hyder Bux Jatoi before singing his "Jeay Sindh aen jeay Sindh, Jam-e-Muhabat pieay Sindh" and "Paan Kkay haan aazad ghurjay watan" poetry.

Supporting paragraphs: Gale Benson Michael X
Answer: 1975