Part of a series on
Forced labour and slavery
Contemporary Child Labour Child soldiers Conscription Debt Forced marriage Bride buying Child marriage Wife selling Forced prostitution Human trafficking Involuntary servitude Peonage Penal labour Contemporary Africa 21st-century jihadism Sexual slavery Wage slavery
Historical Antiquity Egypt Babylonia Greece Rome Medieval Europe Ancillae Black Sea slave trade Byzantine Empire Kholop Prague slave trade Serfs History In Russia Emancipation Thrall Genoese slave trade Venetian slave trade Balkan slave trade Muslim world Slavery in the Abbasid Caliphate Slavery in al-Andalus ‎ Baqt Contract of manumission Bukhara slave trade Crimean slave trade Khazar slave trade Khivan slave trade Ottoman Empire Avret Pazarları Barbary Coast slave trade pirates Sack of Baltimore Slave raid of Suðuroy Turkish Abductions Concubinage history Ma malakat aymanukum Avret Pazarları Harem Abbasid harem Ottoman Imperial Harem Safavid imperial harem Qajar harem Jarya/Cariye Odalisque Qiyan Umm al-walad Circassian slave trade Saqaliba Slavery in the Rashidun Caliphate Slavery in the Umayyad Caliphate Slavery in the Abbasid Caliphate Volga Bulgarian slave trade 21st century Atlantic slave trade Bristol Brazil Database Dutch Middle Passage Nantes New France Panyarring Spanish Empire Slave Coast Thirteen colonies Topics and practice Conscription Ghilman Mamluk Devshirme Blackbirding Coolie Corvée labour Field slaves in the United States Treatment House slaves Saqaliba Slave market Slave raiding Child soldiers White slavery Naval Galley slave Impressment Pirates Shanghaiing Slave ship
By country or region Sub-Saharan Africa Contemporary Africa Trans-Saharan slave trade Red Sea slave trade Indian Ocean slave trade Zanzibar slave trade Angola Chad Comoros Ethiopia Mali Mauritania Niger Nigeria Seychelles Somalia Somali slave trade South Africa Sudan Zanzibar North and South America Pre-Columbian America Aztec Americas indigenous U.S. Natives United States Field slaves female Contemporary maps partus prison labour Slave codes Treatment interregional Human trafficking The Bahamas Canada Caribbean Barbados British Virgin Islands Trinidad Code Noir Latin America Brazil Lei Áurea Colombia Cuba Haiti revolt Restavek (Encomienda) Puerto Rico East, Southeast, and South Asia Human trafficking in Southeast Asia Bhutan Brunei China Booi Aha Laogai penal system India Debt bondage Chukri System Indonesia Japan comfort women Korea Kwalliso Malaysia Maldives Slavery in the Mongol Empire Thailand Yankee princess Vietnam Australia and Oceania Australia Human trafficking Blackbirding Slave raiding in Easter Island Human trafficking in Papua New Guinea Blackbirding in Polynesia Europe and North Asia Sex trafficking in Europe United Kingdom Penal Labour Slavery Denmark Dutch Republic Germany in World War II Malta Norway Poland Portugal Romania Russia Spain Sweden North Africa and West Asia Afghanistan Algeria Bahrain Egypt Human trafficking in the Middle East Iran Iraq Jordan Kuwait Lebanon Libya Morocco Oman Palestine Saudi Arabia Syria Tunisia Qatar Yemen United Arab Emirates
Religion Bible Christianity Catholicism Mormonism Islam Judaism Baháʼí Faith
Opposition and resistance Abolitionism U.K. U.S. Brussels Anti-Slavery Conference 1889–90 Temporary Slavery Commission 1926 Slavery Convention Committee of Experts on Slavery Advisory Committee of Experts on Slavery Ad Hoc Committee on Slavery Supplementary Convention on the Abolition of Slavery Abolitionists Anglo-Egyptian Slave Trade Convention Anti-Slavery International Blockade of Africa U.K. U.S. Colonization Liberia Sierra Leone Compensated emancipation Freedman Manumission Freedom suit Slave Power Underground Railroad songs Slave rebellion Slave Trade Acts International law Third Servile War 13th Amendment to the United States Constitution Timeline of abolition of slavery and serfdom Abolition of slave trade in Persian gulf [fa]
Related Common law Indentured servitude Forced labour Fugitive slaves laws convention Great Dismal Swamp maroons List of slaves owners last survivors of American slavery List of slavery-related memorials and museums Slave marriages in the United States Slave narrative films songs Slave name Slave catcher Slave patrol Slave Route Project breeding court cases Washington Jefferson J.Q. Adams Lincoln Emancipation Proclamation 40 acres Freedmen's Bureau Iron bit Emancipation Day

The Supplementary Convention on the Abolition of Slavery, the full title of which is the Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similar to Slavery, is a 1956 United Nations treaty which builds upon the 1926 Slavery Convention, which is still operative and which proposed to secure the abolition of slavery and of the slave trade, and the Forced Labour Convention of 1930, which banned forced or compulsory labour, by banning debt bondage, serfdom, child marriage, servile marriage, and child servitude.

The Supplementary Convention on the Abolition of Slavery was preceded by the 1926 Slavery Convention. In 1932 the Committee of Experts on Slavery was established to investigate the efficiency of the 1926 Slavery Convention,^[2] which in turn resulted in the establishment of the permanent Advisory Committee of Experts on Slavery (ACE).^[3] The global investigation of the occurrence of slavery and slave trade performed by the ACE between 1934 and 1939 was interrupted by the outbreak of the World War II, but it was the foundation for the work against slavery performed by the UN after the war.^[4]

When the League of Nations was succeeded by the United Nations (UN) after the end of the World War II, Charles Wilton Wood Greenidge of the Anti-Slavery International worked for the UN to continue the investigation of global slavery conducted by the ACE of the League, and in February 1950 the Ad hoc Committee on Slavery of the United Nations was inaugurated.^[5] By the 1950s, legal chattel slavery and slave trade was formally abolished by law in almost the entire world, with the exception of the Arabian Peninsula. Chattel slavery was still legal in Saudi Arabia, in Yemen, in the Trucial States and in Oman, while slavery in Qatar was abolished in 1952, and slaves were supplied for the Arabian Peninsula by the Red Sea slave trade.

The UN Committee on Slavery presented its raport of global slavery to the United Nations Economic and Social Council in 1951; it was published in 1953, and a Supplementary Convention on the Abolition of Slavery was written in 1954, and introduced in 1956.^[6]

In the 1950s, in connection to the Ad Hoc Committee on Slavery and the Supplementary Convention on the Abolition of Slavery, Barnett Janner described Saudi Arabia and Yemen as the only remaining states were slavery was still a legal institution:^[7]

The shipping of slaves occurs in only one particular area of the world, in the seas around Arabia. The warships most likely to search such slavers would be British, and I feel sure that there would not be any abuse of the right to search. I am sorry that we gave up the fight for that right. As far as I know, Saudi Arabia and Yemen are the only States in the world where chattel slavery is still a legal institution. Only a year or so ago a French Deputy—the person, I assume, to whom my hon. Friend referred—investigated the situation and found that every year ignorant Africans are lured on by agents to make a pilgrimage to Mecca. They are not told, of course, that they need a Saudi Arabian visa. When they arrive in Saudi Arabia without a visa they are arrested and put into prison for a few days and then handed over to licensed slave dealers. In addition, raids are made in Baluchistan and the Sheikdoms of the Persian Gulf and people are captured and carried off by land and sea, taken to small Saudi Arabian ports and sold in slave markets.

Article 1: The parties commit to abolish and abandon debt bondage, serfdom, servile marriage and child servitude.

Article 2: The parties commit to enacting minimum ages of marriage, encouraging registration of marriages, and encouraging the public declaration of consent to marriage.

Article 3: Criminalisation of slave trafficking.

Article 4: Runaway slaves who take refuge on flag vessels of parties shall thereby ipso facto attain their freedom.

Article 5: Criminalisation of the marking (including mutilation and branding) of slaves and servile persons.

Article 6: Criminalisation of enslavement and giving others into slavery.

Article 7: Definitions of "slave", "a person of servile status" and "slave trade"

Article 9: No reservations may be made to this convention.

Article 12: This Convention shall apply to all non-self-governing-trust, colonial and other non-metropolitan territories to the international relations of which any State Party is responsible.

• Anti-Slavery International
• Contemporary slavery
• History of slavery
• Slave Trade Acts
• Slavery in international law
• Slavery in the Trucial States
• Slavery in Saudi Arabia
• Slavery in Qatar
• Slavery in Kuwait
• Slavery in Bahrain

• Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similar to Slavery, 226 U.N.T.S. 3, entered into force 30 April 1957. Text of the Supplementary Convention on the Abolition of Slavery