Here's one I hope we can all agree on: the "trade" of people, especially of impoverished women, is a crime that cries out to heaven.
Major global events which draw large crowds from around the world also hide a dirty secret: the trafficking of people, essentially kidnapped into slavery, and often used for prostitution.
I first noticed the news covering this story around the last Super Bowl and around the Olympics in Vancouver. Now, the bishops are raising concerns about the World Cup. I'd guess that the Shanghai World Exposition has its share of forced labor and imported prostitution as well, though I haven't heard anything on the news.
Again, I'm in the sorry position of having more questions than answers. I don't know what steps we might take to protect the vulnerable or to reduce the demand for such inhumanity. But it's something to think and pray about.