article_snippet.sent: Andrew Chan has been called the ringleader and 33-year-old Sukumaran has been described as Andrew Chan collaborator.  
article_snippet.sent: Andrew Chan was named by others as the mastermind of the smuggling plot.
article_snippet.sent: Tan Duc Thanh Nguyen .
article_snippet.sent: Tan Duc Thanh Nguyen from Brisbane, who is now 31, was one of four drug couriers in the case.