You would have slaves, based on modern slavery definitions. Australia certainly does. These aren't chattel slaves legally owned by landowners, etc.
Rather they are working under debt bondage, sex trafficking, forced marriage, etc.
I'm not suggesting this is 'the same', merely that when people are talking about First World slavery in modern terms, it's a broader definition that chattel slavery.
In Australia, there are reporting requirements on businesses around this issue, depending on class, etc.
www.legislation.gov.au