6. Joaquin Loera

Loera was a Mexico based criminal, who basically dealt with drugs. He packed his bank accounts with the business of drug dealing. He was known by various nick names in the criminal world. He was called as El Chapo and Crystal King also. 

He was reportedly the most powerful drug dealer on the Earth, which quotes his real income as $5 billion. But, as per the records it has been stated as $1 billion only. He has also been listed as the 937th richest man inn the world by Forbes in 2010.