There are more slaves today than there have been in any other time in history. According to the "Not For Sale Campaign," there are over 27 million slaves today. There's a documentary called Trade coming out at the end of the month that I'm sure would be extremely difficult to watch, but would raise awareness to this hidden sin.
This is a biblical heart-of-God issue, as William Wilberforce said:
"The fatal habit of considering Christian morals as distinct from Christian doctrines insensibly gained strength. Thus the peculiar doctrines of Christianity went more and more out of sight, and as might naturally have been expected, the moral system itself also began to wither and decay, being robbed of that which should have supplied it with life and nutriment."
The moral system should be supplied by the motive of doing all things for the glory of God