Theres no such thing as chattel slavery in Islam.
It is an action of the upmost wretchedness to set out to catch human beings for the purpose of putting them to labor against their will. Thats called theft. It doesnt matter if the theft is done by john oconnor or yahya al kuni.
Slavery in islam is a social caste resulting from religious conflict and even then the Deen says to depopulate this social caste.