A drug dealer from Royston has been jailed for 14 years at Sheffield Crown Court.
Paul Alan Lowe, 41, of Arundel Gardens, Royston, was one of five men who were locked up for a total of 50 years for drug trafficking offences.
He was arrested in January when police carried out a series of raids in Barnsley, Lincolnshire and Nottinghamshire.
Officers from the Serious and Organised Crime Unit spent 18 months working on Operation Metric to identify those involved in the large-scale supply of class A and B drugs across South Yorkshire. The operation led to drugs with a street value of £400,000 and a 'significant' amount of cash being seized.
Detective Chief Inspector Mark Wilkie said: "These sentences are the culmination of a complex and protracted investigation of an organised crime group that systematically distributed, around the north of England and within South Yorkshire, large quantities of Class A and B controlled drugs."
He said it showed police would do 'whatever it takes' to hunt down drug trafickers and bring them to justice.
"We will now move on with the same determination to do what we can to take from them any proceeds of their criminal activity through the use of confiscation orders," he added.
Lowe was convicted of conspiracy to supply class A and B drugs.