United Nations 1956 Supplementary Convention on the Abolition of Slavery
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The United Nations 1956 Supplementary Convention on the Abolition of Slavery, the Slave Trade, and Institutions and Practices Similar to Slavery banned debt bondage, serfdom, servile marriage and child servitude.

The original article can be found at: http://en.wikipedia.org/wiki/United_Nations_1956_Supplementary_Convention_on_the_Abolition_of_Slavery.
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