I have an interesting Yakuza story that I want to share:

One of my Japanese friends used to work for the Yakuza (without being a member). His job was to play Pachinko at rigged machines. The way Pachinko works is that every day some machines are randomly selected to be winning machines. The Yakuza somehow had intel on what machines were winners and relayed the info to their crew of seemingly normal gamblers.

They had to play for the whole day and in the night gave the winnings to their Yakuza contact. The sad thing is that most of his "colleagues" instantly went back to the Pachinko hall to gamble away their cut.