There are thought to be nearly 100,000 Yakuza members in Japan. When they enlist in individual gangs they are taken to a secret location where they are trained in hand-to-hand combat and meditation.

It expanded significantly from the late 1950s to the early '70s, becoming the most powerful yakuza gang in Japan. The year 2005 proved to be a pivotal one for the group, as two new leaders took ...