Six traffickers who transported heroin and crack cocaine from London and Norwich and supplied to more than 270 dealers in the city have been jailed for a total of 42 years.
The defendants, all in their 20s, played various roles in an operation using a route tagged The Jamie line.
Following a seven-week trial, the leader of the gang Kenechi Ochereobia, 25, of Panylan, Cardiff, was jailed for 12 years for conspiracy to supply Class A drugs.
His younger brother Oluchi Ochereobia, 22, of Hackney, London, was handed eight years, after he took over running of the operation in August 2016.
They were convicted by a jury at Blackfriars Crown Court.
Kenechi controlled the operation through a central mobile phone number, which he and his brother used to contact hundreds of numbers via text when they had supplies of drugs available.
The brothers would receive orders back, and then instruct others to supply the users in Norwich.
Their couriers would then collect the money in exchange for the drugs in Norwich.
Sentencing them, Judge Jane Sullivan said: 'This was a well organised and profitable business as evidenced by the £20,000 found in a safe in your house in Cardiff.
'You travelled frequently between your partners home in Cardiff and your parents house in London, overseeing the running of the drugs line.'
On one trip they made £5000 from three days dealing in Norwich.
Kenechi Ochereobia ran a clothing brand called AP which the prosecution argued was a front for his drug dealing.
He would switch mobile phones on a bi-weekly basis and would use hire cars as transport.
Their racket was stopped in September 2016 after they were all arrested by police.
Frankie Dos Santos, 25, of Hackney, London, whose father works for Hackney council, was handed seven years for working as a drugs courier.
'Trusted lieutenant' to Ochereobia, Jaivon Prince, 20, received six years for his role managing and transporting the drugs.
He was arrested at Liverpool Street station boarding a train to Norwich with hundreds of wraps inside his body of heroin and crack cocaine.
Calvyn Green, 25, of Hackney, London, was given five years for his role as courier in the group.
Elliot Murawski, 26, of Riverside Road, Norwich, became a distributor of heroin after he himself became addicted and owed the gang money. He was given four years in jail.
Jaivon Prince, 20, of Hackney, London, was given six years for possession with intent to supply Class A drugs.
In a packed public gallery, family members wept and gasped as the sentences were read out.
Kenneth Millet, prosecuting said: 'The case revolved 'the Jamie Line', which all acknowledge was the conduit for the supply of heroin and crack cocaine to some 273 Norwich based drug users.
'Drugs would be couriered from London to Norwich, where they would be dealt from safe houses.
'Drugs would then be delivered to locations throughout Norwich by a runner.
'It is clear from the evidence that the Jamie Line was already up and running and supplying drugs prior to conspiracy period of March to September 2016.
'A complete qualification of the drugs supplied over this period cannot be precisely identified.
'However it is clear that substantial amounts of cocaine and heroin was supplied, around 1.5 kilograms.
'The crown suggest a substantial profit was made, and a lavish lifestyle enjoyed by Kenechi Ochereobia and others.
'The crown have always contended that the AP brand was used by him as a front, a cover by which he would seek to explain his level of income and lifestyle should he be subject to the attention of the authorities.'
Speaking after the case, Det Sgt Paul Harris, from the Met's Trident and Area Crime Command, said: 'This was a complex investigation spanning from Cardiff to Norwich via London. Kenechi Ochereobia tried to hide his involvement in the large-scale supply of drugs in Norwich by pretending to be a legitimate clothes distributor, whilst in reality he was getting younger gang members to run drugs across the country. I would like to thank South Wales Police and Norfolk Constabulary for their support on this operation.'
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