A man from Sully has been charged in connection with an organised crime gang producing class B drugs.
20 people were arrested in a series of raids across South Wales and the West Country.
Eleven men have since been charged with conspiracy to produce cannabis, including 27 year-old Beqir Dedej.
Two of the men are also accused of possessing criminal property and offences relating to the Identity Document Act.
More than sixty officers seized over 140 kilos of the drug stored in wholesale vaccum packed bags - along with around £350,000 in cash and ten vehicles - when they searched seven premises.
The joint operation involved officers from the South Wales, Gwent and Dyfed Powys police forces, along with the regional organised crime unit Tarian and immigration enforcement officers. Another warrant was carried out in Yeovil by Avon and Somerset Police.
According to a Tarian officer, Operation Altar had led to the closure of twelve cannabis grows across South Wales.
Detective Inspector Vinnie Easton said: "The threat posed by organised crime groups such as this one cannot be understated. They prey on the vulnerable within our communities, utilise violence and intimidation tactics, and do not care about the harm they bring. Their only concern is profit."
"Operation Altar continues, and I encourage anyone who has information about suspected cannabis cultivation or drug activity to report anonymously to 101 or Crimestoppers."
Two men of no fixed abode will be sentenced at a later date after pleading guilty in court to producing controlled class B drugs, namely cannabis.
Richard Johnson, the Home Office’s immigration compliance enforcement lead for Wales and the West of England, added: "The way people are treated when they are employed illegally is inhumane and abhorrent; a far cry from the lies they are sold by the gangs who facilitate their journeys into the UK."
“We know that employment is one of the biggest pull factors for people coming here, and it is important for them to understand that they can find themselves trapped in unsafe and insecure conditions, facing exploitation and even modern-day slavery."
“We’re pleased to have contributed to the shutting down of this exploitative and illegal operation.”
Gavin & Stacey: The Finale - Everything you need to know about the final episode on Christmas Day
Welsh Tory leader resigns after split vote
Busy Cardiff Bay road reopens temporarily
Designated driver scheme returns for Christmas
Woman in court over paddleboarders' deaths
Full house for Knock Off Nessa
Man dies in hospital after Port Road collision
Cardiff Road shut after three-vehicle collision
Carers urged to know their rights
'A Special School' returns for series three
More foster carers needed in the Vale
Review: Hamilton - Don't Miss Your Shot!
Drifting fishing boat rescued near Stout Point
Uncertain future for 10k races
Penarth: work underway on extra care housing
Aviva to withdraw from Barry Biomass
Barry stabbing: two youths in court
‘Long way to go’ for crisis-hit WRU
