- Slavery in international law is governed by a number of treaties, conventions and declarations. Foremost among these is
the Universal Declaration on Human Rights (1948) that states in Article 4:
“no one should be held in slavery or servitude, slavery in all of its forms should be eliminated.”
https://en.wikipedia.org/wiki/Slavery_i ... tional_law
This absolute moral law [ought/should] on slavery is abstracted from empirical experiences [is] of mankind.
Note absolute moral laws are never political based legislature laws.
Besides the UN is not God.
Note my related argument to support the above.
'Ought' from 'Is' is Possible