Welcome to the forum.
You are right about "trafficking" - in this piece, it refers to "human trafficking".
Do you understand what "hell" is? Do you understand what "earth" is?
"Hell" is a terrible place (allegedly). Most of us would not want to experience it. If something is "hell on earth" it means that it is a very unpleasant experience which the people in the piece are experiencing right here, right now, on planet earth and while they are still alive! It does not mean that it is "common in today's world".