Gaza's underground lifeline is under threat from above.
Smugglers known as kamikazes haul cheap gas from Venezuela into Colombia.
A secret part of the internet is revolutionizing drug dealing.
Under the guise of religion, refugees are being trafficked into the sex trade.
The most trafficked mammal may go extinct before most people know what it is.
A new kind of dating is changing the rules of prostitution and romance.
Ukraine's citizens rely on smuggling contaminated cigarettes into the EU.
London's public housing has become ground zero for all manner of illegal business.
Discrimination has led Vietnam's trans community into seeking illegal treatments.
Young Japanese gangs are using underground fighting to break away from the Yakuza.