noun
unauthorized cartel; illegal cartel
Refers to a cartel that operates outside official regulations or approval, often in illegal or underground markets.
闇カルテルが市場を支配していると報じられた。
It was reported that an unauthorized cartel controls the market.
Compound of 闇 (yami, 'darkness; underground') and カルテル (loanword from German 'Kartell' or English 'cartel'), referring to an unauthorized or illegal cartel.