Three fraternities were suspended by UNC on Friday following the arrests
On Thursday prosecutors and sheriffs announced they had broken up a cartel
21 people have been arrested since July as part of the drug operation sting
The suspects range in age from 22 and 35; many were based in North Carolina
They include current and former students from Duke and UNC Chapel Hill
Together, they sold over $1.5million of cocaine and marijuana, prosecutors said
Prosecutors say they are hardened drug dealers with brazen attitudes
Many of the suspects have prior arrests and have already graduated
Some of the most serious charges carry sentences of 10 years to life