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