Yamaguchi-Gumi (klan Yakuza terbesar)




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Daimon of the Yamaguchi-gumi

Founding location Kobe, Japan
Years active 1915-present
Territory Primarily based in Kobe but has territory all over Japan, including in Tokyo
Ethnicity Japanese, Korean Japanese
Membership 55,000
Criminal activities arms trafficking, assassinations, bank fraud, bid rigging, blackmail, bookmaking, contract killing, extortion, drug trafficking, illegal gambling, Internet pornography, loansharking, mail fraud, match fixing, money laundering, mortgage fraud, murder, prostitution, racketeering, securities fraud, sōkaiya, wire fraud, and infiltration of legitimate businesses
Rivals Notably the Dojin-kai, Kudo-kai, Taishu-kai, Goda-ikka, Asano-gumi, Kyosei-kai, and to a lesser extent, Sumiyoshi-kai, Inagawa-kai among others

The Sixth Yamaguchi-gumi (六代目山口組 Rokudaime Yamaguchi-gumi?) is Japan‘s largest and most infamous yakuza organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for dockworkers in Kobe pre-WWII.

It is one of the largest criminal organizations in the world. Estimates put the number of active members at just over 55,000, with thousands more having strong associations. It is, by far, the largest of the boryokudan groups, and its membership encompasses roughly 45% of the 86,300 yakuza in the Japanese underworld. Formal members of the Yamaguchi-gumi number 102 people in total; 1 kumicho, 15 shatei (younger brother) and 86 wakachu (child) as of November 2005.

The Yamaguchi-gumi are among the world’s wealthiest gangsters, bringing in billions of dollars a year from extortion, gambling, the sex industry, guns, drugs, and real estate and construction kickback schemes. They are also involved in stock market manipulation and Internet pornography.

The Yamaguchi-gumi has its headquarters in Kobe, Japan, but it operates all across Japan and has overseas operations in Asia and the United States. Despite more than a decade of police crackdowns, their numbers have been growing. Its current kumicho (Boss), Shinobu Tsukasa, has declared an expansionist policy – even making inroads into Tokyo, traditionally not Yamaguchi turf. They also have multiple groups working overseas.




When Taoka inherited the title of kumicho, it was merely a local family with only a few dozen members. It was Taoka who made Yamaguchi-gumi the world’s largest criminal organization. He urged his underlings to have legitimate businesses and allowed them to have their own family, which became a kind of subsidiary family of Yamaguchi-gumi. He also created a structural system in the family. Wakagashira were elected as underbosses to the kumicho and some of powerful members were elected as wakagashira-hosa (deputy underbosses).


4th kumicho (1984–1985): Masahisa Takenaka

After the death of Taoka, the heir apparent wakagashira Kenichi Yamamoto (kumicho of the Yamaken-gumi) was serving a prison sentence. He died of liver failure shortly afterward. Fumiko Taoka, Kazuo Taoka’s wife, stepped forward to fill the leadership void until a new kumicho could be selected by a council of eight top-level bosses.

The current head, Shinobu Tsukasa, is the founder of the Kodo-kai, a Nagoya-based clan raised in the late 20th century.

In 1984, the elders chose Masahisa Takenaka (kumicho of the Takenaka-gumi) to be the fourth kumicho of Yamaguchi-gumi. One of the other contenders, Hiroshi Yamamoto (kumicho of the Yamahiro-gumi), broke away from Yamaguchi-gumi with many of its powerful members and more than 3,000 of its soldiers to form the Ichiwa-kai. A bitter rivalry existed between the two groups, which led to an all-out war (the Yama-Ichi War) after the Ichiwa-kai’s 1985 assassination of Takenaka and wakahashira Katsumasa Nakayama. During the war, acting-kumicho Kazuo Nakanishi (kumicho of the Nakanishi-gumi) and wakagashira Yoshinori Watanabe (kumicho of the Yamaken-gumi) briefly took the leadership role until 1989.


The Yama-Ichi War ended with retirement of Hiroshi Yamamoto which was arbitrated by one of the most respected bosses Seijo Inagawa. After that, the clan elected wakagashira Yoshinori Watanabe as 5th kumicho of the organization. Masaru Takumi (kumicho of Takumi-gumi) was elected as wakagashira. He was so powerful and respected within the organization that his influence overshadowed that of kumicho to some extent.


  • 6th kumicho (2005–present): Shinobu Tsukasa (real name: Kenichi Shinoda)

In 1997, then powerful wakagashira Masaru Takumi was assassinated by underlings of then wakagashira-hosa (deputy underboss) Taro Nakano. After this assassination, they were unable to choose a new wakagashira for more than eight years. As a result, leadership of the organization became weaker. Finally, in 2005, wakagashira-hosa Shinobu Tsukasa (then kumicho of the Hirota-gumi) was chosen as new wakagashira and shortly afterward, in August 2005, Tsukasa inherited the position of the 6th kumicho of the Yamaguchi-gumi.

Watanabe has retired to private life — rather uncommon in Yakuza circles, as bosses usually do not retire until their death. Under Tsukasa’s leadership, the 6th Yamaguchi-gumi has resumed expansion. Kiyoshi Takayama, kumicho of the Kodo-kai, was elected as wakagashira. They absorbed the Tokyo-based gang Kokusui-kai, thus acquiring lucrative turf in the capital. Tsukasa was imprisoned in December 2005 for illegal gun possession, and was released in April 2011 after serving nearly six years in jail.

Relief support after disasters

Immediately after the Kobe Earthquake of 1995, the Yamaguchi-gumi started a large-scale relief effort for the earthquake victims, helping with the distribution of food and supplies. This help was essential to the Kobe population, because official support was inconsistent and chaotic for several days.

The Yamaguchi-gumi also provided relief in the wake of the 2011 Tōhoku earthquake and tsunami by opening its offices to the public and by sending supplies to affected areas.

Assassination of Iccho Itoh

On April 17, 2007, Tetsuya Shiroo, a senior ranking member of the Suishin-kai (an affiliated Yakuza family to the Yamaguchi-gumi), assassinated Iccho Itoh, the mayor of Nagasaki, over an apparent dispute over damage done to Shiroo’s car at a public works construction site.

On May 26, 2008, Tetsuya Shiroo was sentenced to death.  However, the Fukuoka High Court revoked the death sentence and sentenced him to life imprisonment on September 29, 2009.


In February 2012 the US Treasury Department announced a freeze on American-owned assets controlled by the organization and its top two leaders.


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