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Yakuza, Gangster Organization
A group that has power using violence? Sounds like a crime syndicate to me, probably the Yakuza or some other gangster organization .
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.
What’s the difference between the Yakuza and Kanto Rengo?