Crime Syndicate
Yakuza, Gangster Organization
noun
A group that has power using violence? Sounds like a crime syndicate to me, probably the Yakuza or some other gangster organization .
ぼうりょくだん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
暴力団と関東連合の違いは何ですか？
What’s the difference between the Yakuza and Kanto Rengo?