The apostle Paul condemned slave-trading as sinful (1st Timothy 1:9-10, "kidnappers" in the NKVV). Slave-trading is a sin that would have gotten a Christian ejected from the local assembly. Christianity's basic principles (e.g. Galatians 3:28) undermine involuntary slavery.
Jack is the teaching elder of Ironworks Pike Community Church. He is a graduate of Columbia Biblical Seminary http://www.ciu.edu.