How did American occupation affect the major Yakuza clans?

Question:

Answer:

You seem interested in the yakuza. It's not likely that there are a lot of people on this forum who have any clue about the yakuza at the conclusion of WWII. Might I suggest you use a search engine? You will likely find the answers if they are to be found.

I did find your Additional Details amusing. Post WW2. That's kinda' the definition of the American occupation so it's a bit redundant.