found this in wiki
In 1999, Italian-American mafia Bonanno family member, Mickey Zaffarano, was overheard talking about the profits of the pornography trade that both families could profit from.[21] Another yakuza racket is bringing women of other ethnicities/races, especially East European[21] and Asian[21]

is this real? has anyone heard of this? and what other stuff are they into in usa?

They're all over the place in Hawaii, apparently.

geographically speaking i would think most activity would be on the west coast, and as was mentioned Hawaii.

The Yoshitomi Group is active in Los Angeles, Chicago and New York. They mostly concentrate on the drug trade and use Hmong gangs for muscle.

http://getglue.com/topics/p/yoshitomi_group