Don't get me wrong, formal business conglomerates do all kinds of crimes.
But confusing the yakuza & zaibatsu is kind of like confusing the Sicilian mafia with DuPont.
Yakuza: street-level vice. Gambling, sex work, mostly lower-class Japanese people & Japan-born Korean immigrants. The kind of crime that's fed by limited opportunities for marginalized people.
Zaibatsu: wealthy families who industrialized Japan. Very official. Crimes committed are of the white-collar variety.