21 people have been arrested since July as part of the drug operation sting
The suspects range in age from 22 and 35 and include current and former students from Duke and UNC Chapel Hill in North Carolina
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 between 10 years behind bars and life
Three UNC fraternities named in connection to federal drug-trafficking investigation
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DEA Investigation in Chapel Hill Area Uncovers Large-Scale Drug Ring
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Drug ring busted at UNC, Duke, Appalachian State frats: feds
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