<Tr> <Th> Principal families </Th> <Th> Description </Th> <Th> Mon (crest) </Th> </Tr> <Tr> <Td> Yamaguchi - gumi (六 代目 山口組, Rokudaime Yamaguchi - gumi) </Td> <Td> The Yamaguchi - gumi is the biggest yakuza family, accounting for 50% of all yakuza in Japan, with more than 55,000 members divided into 850 clans . Despite more than one decade of police repression, the Yamaguchi - gumi has continued to grow . From its headquarters in Kobe, it directs criminal activities throughout Japan . It is also involved in operations in Asia and the United States . Shinobu Tsukasa, also known as Kenichi Shinoda, is the Yamaguchi - gumi's current oyabun . He follows an expansionist policy, and has increased operations in Tokyo (which has not traditionally been the territory of the Yamaguchi - gumi .) <P> The Yamaguchi family is successful to the point where its name has become synonymous with Japanese organized crime in many parts of Asia outside Japan . Many Chinese or Korean persons who do not know the name "Yakuza" would know the name "Yamaguchi - gumi", which is frequently portrayed in gangster films . </P> </Td> <Td> <P> "Yamabishi" (山 菱) </P> </Td> </Tr> <P> The Yamaguchi family is successful to the point where its name has become synonymous with Japanese organized crime in many parts of Asia outside Japan . Many Chinese or Korean persons who do not know the name "Yakuza" would know the name "Yamaguchi - gumi", which is frequently portrayed in gangster films . </P> <P> "Yamabishi" (山 菱) </P>

Who are the yakuza and how are they organized