In the clip below the uninformed former Australian Prime Minister Kevin Rudd compares the chattel slavery of the Americas with the non-oppresvive slavery God permitted the Israelites.
It would seem that Mr. Rudd has not taken the time to inform himself on the differences in the slavery permitted by God and that practised in the Americas. It should also be noted that God permitted things with which He did not prefer e.g. divorce and slavery. In the Bible slavery is mentioned as a curse for sin.
The God of the Bible permitted the Israelites to have slaves however in Exodus 23:9 He commanded them not to oppress their slaves.
New International Version Exodus 23:9
“Do not oppress a foreigner; you yourselves know how it feels to be foreigners, because you were foreigners in Egypt.