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.”
Plans are under consideration to build over 200 houses in a sleepy Welsh village
Sanitary disposal bins introduced in men's public toilets following "Bins for Boys" campaign
Officers called to Dinas Powys Woods after young person enters the river
Three Reform candidates quit in Pen-y-Bont Bro Morgannwg constituency
Six events taking place in the Vale of Glamorgan this weekend
Vale Council signs off placemaking plan for Barry
Plans filed to use Blackweir Fields for a series of live events this summer
Plans filled for controversial housing development in Cowbridge
Cardiff Council pledges to work with new Welsh Government to tackle trouble-plagued hospital
Two local candidates stand down after revelations
RNLI issues Sully Island safety advice after first call out of the year to the Island
Morio Lounge on course to open at Nell's Point in May
Vale Council appoints specialist contractors to carry out road improvements
Three men jailed for their roles running a drugs line which supplied cocaine in Barry
Police appeal for witnesses after fatal Penarth Road collision
New Beach and country park facilities opened following major investement
RNLI centre at Barry Island welcomes lifeguards back to Whitmore Bay
Severn tidal lagoons progress
