Both Slave and Free

I remember reading Revelation 6:15 for the first time and thinking...........slaves?? In this day and age? It's like reading about beheading in Revelation, too. I couldn't wrap my head around this medieval way of murdering. It baffled me. Who would have thought that slavery would be such a current topic in 2017? AND beheading !! This is a very disturbing article. It appears that modern day slavery is more lucrative than it's ever been.

Revelation 6:15 "Then the kings of the earth, the princes, the generals, the rich, the mighty, and everyone else, both slave and free, hid in the caves and among the rocks of the mountains".