Gangland is used to describe activities or people that are involved in organized crime.
It’s been suggested they were ~ killings...
...one of Italy’s top ~ bosses.
ADJ: ADJ n
GANGLAND
Meaning of GANGLAND in English
Collins COBUILD. Толковый словарь английского языка для изучающих язык Коллинз COBUILD (международная база данных языков Бирмингемского университета) . 2012