I should quote from an older book called 'Confessions of a Yakuza', on the Yakuza from about 80 years ago, it's just so fitting:
>The real reason why the police set him up, of course, was to improve the district’s anti-crime record. Sometime after I left jail—around 1938, I suppose it would have been—I had just the same kind of trouble myself at my joint in Uguisudani. Told me, in just the same way, to hand in my guns. This particular detective came straight from the Metropolitan Police Board—the very top. I expect they’d been tipped off that some yakuza somewhere had got hold of a few pistols, so they planned to make a clean sweep. But there weren’t any in my place to begin with, and there was nothing I could do.
>So they told me to produce some even if I had to buy them. It was way out of line, but if I’d gone on insisting I didn’t have any, I’d have ended up the same as Kan-chan, so I got a brother to buy me a couple at three hundred and fifty yen apiece. That was enough to buy a house with in those days, but I couldn’t afford to think about that.
>I turned them in to the police immediately. “Good work,” they said—and that was the last I heard about it: no letter of thanks, and no punishment, either....