I can relate to the annoyance -I questioned using it in the title. I am sure that many feel the term modern day slavery has more punch than the term human trafficking. Others find it a bit on the spin side, and thus can blur the issue. I found  CIW's reasoning behind their use of the term to be very interesting, and thus kept it in the title.

There is a difference between the conditions that "modern day slavery" is meant to represent and what many think of as traditional slavery or chattel slavery  -Wikipedia link on slavery. My understanding is that there is an active chattel slave trade in existence in the Sudan and Mauritania.

I don't think the term white slave trade is used that much in the Western press. There was an anti-white slave trade movement in the late 1800s, early 1900s here in the US, and I think in Britain. But if interested, it is well worth reading about, as there are some parallels with the current counter human trafficking movement. Jo Doezema wrote an interesting article on the subject.