Japan is a country where it was legal for people to form gangs. Therefore, there were various gangs and organizations in this country’s society.

The famous movie star, Jackie Chan, had once starred in a movie named . The background of the plot in the movie was about the Japanese yakuza.

In Japan, the Yamaguchi Group and the Inagawa-kai were naturally the leader and bosses at the top of the pyramid.

However, not all yakuza were from the Yamaguchi Group or the Inagawa-kai.

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