Dojin-kai
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yakuza , also known as , are members of transnational organized crime syndicates originating in Japan. The Japanese police and media (by request of the police) call them , while the yakuza call themselves . The English equivalent for the term ''yak ...
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headquartered in
Kurume, Fukuoka is a city in Fukuoka Prefecture, Japan. , the city had an estimated population of 295,367 in 137,140 households, and a population density of 1309 people per km². The total area of the city is . Geography Kurume is located in the Chikugo Plain ...
, on the
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island of
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,"Boryokudan Situation in 2010"
April 2011, ''
National Police Agency National Police may refer to the national police forces of several countries: *Afghanistan: Afghan National Police *Haiti: Haitian National Police *Canada: Royal Canadian Mounted Police *Colombia: National Police of Colombia *Cuba: National Revolut ...
''
a designated yakuza syndicate, with approximately 310 members.As well as being known as a militant yakuza organization, the Dojin-kai has also been known as a ''de facto''
drug cartel A drug cartel is a criminal organization composed of independent drug lords who collude with each other in order to improve their profits and dominate the illegal drug trade. Drug cartels form with the purpose of controlling the supply of the i ...
, as its activities have allegedly included large-scale
drug trafficking A drug is any chemical substance other than a nutrient or an essential dietary ingredient, which, when administered to a living organism, produces a biological effect. Consumption of drugs can be via inhalation, injection, smoking, ingestion, ...
, specifically
methamphetamine Methamphetamine (contracted from ) is a potent central nervous system (CNS) stimulant that is mainly used as a recreational drug use, recreational or Performance-enhancing substance, performance-enhancing drug and less commonly as a secon ...
trafficking, which is traditionally shunned in the yakuza world. With its activities of drug trafficking, the Dojin-kai has allegedly been Japan's largest wholesale dealer in drugs since the late 20th century, after the disbanding of three other yakuza groups based in northern Kyushu; Tagawa-based Sadaoka-gumi, known as Japan's Methlord in the Showa era, which was crushed by the Taishu-kai, Okawa-based Hamada-kai, and
Kumamoto is the capital Cities of Japan, city of Kumamoto Prefecture on the island of Kyushu, Japan. , the city has an estimated population of 738,907 and a population density of 1,893 people per km2. The total area is 390.32 km2. had a populat ...
-based Yamano-kai.


History

The Dojin-kai was formed in 1971 from four old yakuza groups united by the first president, Isoji Koga (former bakuto yakuza born 1934). Seijiro Matsuo, the Secretary General of the first-generation Dojin-kai, succeeded as the president in 1992."1993 Police White Paper Chapter 1 : The Actual Condition of the Boryokudan"
1993, ''
National Police Agency National Police may refer to the national police forces of several countries: *Afghanistan: Afghan National Police *Haiti: Haitian National Police *Canada: Royal Canadian Mounted Police *Colombia: National Police of Colombia *Cuba: National Revolut ...
''
In the same year, 1992, the Dojin-kai was registered as a designated boryokudan group under the Organized Crime Countermeasures Law.


Gangland vendetta

Very much like other yakuza groups based in the northern Kyushu region such as the Taishu-kai and Kudo-kai, the Dojin-kai has been noted for its aggressive and violent nature, causing numerous bloody conflicts with other yakuza groups. Notable ones include the ''Yama-Michi War'' (, ''1986–1987''), where the organization substantially expelled the largest known
Yamaguchi-gumi is Japan's largest ''yakuza'' organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for longshoreman, dockworkers in Kobe before World War II. It is one of the largest organized cr ...
syndicate from the northern Kyushu area. Another notable one is a brief conflict that occurred in 1983, with the Kanto-based large yakuza syndicate Sumiyoshi Union, in which a majority of Dojin members moved to Tokyo and had been hiding out around Tokyo with the plan of slaying all of the Union's 76 senior bosses until the Union made a conceding offer of peaceful resolution (''teuchi''). The Dojin-kai is noted for having been isolated in the yakuza world in an uncanny way, in contrast to most other yakuza organizations which usually have at least one ally ('' sakazuki''-shared "brother" organization). In one notable anecdote, during the time of the ''Yama-Michi War'', there were several offers of help from other organizations but the Dojin-kai reportedly rejected all of them. The Dojin-kai is a member of an anti- Yamaguchi fraternal federation, the Yonsha-kai, formed with three other northern-Kyushu based independent yakuza syndicates, the Kudo-kai, Taishu-kai and Kumamoto-kai. However even the Kudo-kai, the principal member, is said to have avoided getting deeply involved in the Dojin-kai. The Dojin-kai again started a blatantly vicious conflict with its splinter group, Kyushu Seido-kai, in 2006.


War with the Seido-kai

When the long-time boss Seijiro Matsuo suddenly announced his resignation in May 2006, a war broke out between the headquarters and a splinter group in Omuta who, naming themselves the " Kyushu Seido-kai." They allegedly aligned themselves with the
Yamaguchi-gumi is Japan's largest ''yakuza'' organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for longshoreman, dockworkers in Kobe before World War II. It is one of the largest organized cr ...
, the Dojin-kai's rival and the largest yakuza syndicate in Japan. Seven people were killed during the beginning of the war. In one incident, a gangster walked into a hospital and shot an innocent man twice, mistaking him for a rival. In another, the Dojin-kai's headquarters was sprayed with an
AK-47 The AK-47, officially known as the Avtomat Kalashnikova (; also known as the Kalashnikov or just AK), is an assault rifle that is chambered for the 7.62×39mm cartridge. Developed in the Soviet Union by Russian small-arms designer Mikhail Kala ...
assault rifle. More than five Dojin offices in Kurume and Fukuoka were attacked with bombs and firearms on May 21 of that year, and soon after that, on 24th, Seido-kai's Jinsei group headquarters office in Chikugo was totally destroyed, apparently by Dojin-kai's bombs. On June 13, 2007, Zenji Tsurumaru was killed. On June 19, Hidenori Irie was killed. On August 18, the leader of Dojin-kai, Yoshihisa Onaka was killed. On November 8, a civilian Hiroshi Miyamoto was killed by mistake while receiving treatment at a hospital. On November 12, Shigeki Koga was killed. On November 27, Yoshikazu Matsuo, one of the chairmen, and his driver were killed. Both groups announced a cease-fire on December 18 and on February 5, 2008, the war reportedly ended. The Fukuoka Prefectural Police discovered that the Seido-kai built a
cenotaph A cenotaph is an empty grave, tomb or a monument erected in honor of a person or group of people whose remains are elsewhere or have been lost. It can also be the initial tomb for a person who has since been reinterred elsewhere. Although t ...
in July 2009 in Omuta to pay tribute to their casualties. The names inscribed on its surface not only included those of Seido-kai members but also included those of Dojin-kai members. This cenotaph, however, disappeared by early 2011. The Dojin-Seido war has been escalating since the late 2000s, especially in 2011, when they started using military machine guns and tossing grenades at each other. Many Seido members have escaped from Kyushu since the late 2000s, building an eight-story bulletproof building in Taito, Tokyo as their new base. The first Seido president, Chojiro Murakami, was arrested in
Ibaraki Prefecture is a Prefectures of Japan, prefecture of Japan located in the Kantō region of Honshu. Ibaraki Prefecture has a population of 2,828,086 (1 July 2023) and has a geographic area of . Ibaraki Prefecture borders Fukushima Prefecture to the north, ...
. Kazuma Umeki, one of the top underbosses in the Seido-kai, was attacked with a 10-ton dump truck driven by a Dojin yakuza. In April 2011, two Seido seniors were shot with a revolver in Imari by a Dojin hitman, and Sueharu Matsunaga, the head of the Seido's Matsunaga group, was killed with a bomb.


Activities

Sometimes informally and mockingly dubbed the "Dojin Pharmacy" (''Dōjin Yakkyoku''), the Dojin-kai's activities, the same as its splinter group Seido-kai's, allegedly largely consist of
drug trafficking A drug is any chemical substance other than a nutrient or an essential dietary ingredient, which, when administered to a living organism, produces a biological effect. Consumption of drugs can be via inhalation, injection, smoking, ingestion, ...
.


Drug trafficking

In one notable case, as introduced in the "Drug Criminal Organization" section in the
National Police Agency National Police may refer to the national police forces of several countries: *Afghanistan: Afghan National Police *Haiti: Haitian National Police *Canada: Royal Canadian Mounted Police *Colombia: National Police of Colombia *Cuba: National Revolut ...
's 1991 Police White Paper, a Fukuoka-based 20-member small Dojin-affiliate had managed a systematic trafficking ring, selling methamphetamine to various drug-dealing yakuza organizations throughout the country. This group had also smuggled methamphetamine from
Taiwan Taiwan, officially the Republic of China (ROC), is a country in East Asia. The main geography of Taiwan, island of Taiwan, also known as ''Formosa'', lies between the East China Sea, East and South China Seas in the northwestern Pacific Ocea ...
where it had a connection with a local Taiwanese drug ring. This group had used a small island located in
Kagoshima Prefecture is a Prefectures of Japan, prefecture of Japan located on the island of Kyushu and the Ryukyu Islands. Kagoshima Prefecture has a population of 1,527,019 (1 February 2025) and has a geographic area of 9,187 Square kilometre, km2 (3,547 Square m ...
as a smuggling base. For example in 1986, this group smuggled approximately of methamphetamine—estimated retail price of nearly US$1 billion—from Taiwan.


Relationship with authorities

The Dojin-kai has been known for its strong anti-authority, anti-police stance since the 20th century, however at the same time the Dojin-kai has allegedly developed some relationship with local authorities. It has actually been uncovered, as, in the early 2000s, the Fukuoka Prefectural Police headquarters disclosed that its classified information had leaked out to the Dojin-kai via its branch police departments based in the Chikugo region including Kurume.


Key persons

*Isoji Koga, the first president of the Dojin-kai ::Koga was born on November 6, 1934, in Ogori, Fukuoka. In his boyhood, he was a leading member of an all-Japan youth
judo is an unarmed gendai budō, modern Japanese martial art, combat sport, Olympic sport (since 1964), and the most prominent form of jacket wrestling competed internationally.『日本大百科全書』電子版【柔道】(CD-ROM version of Encyc ...
champion team. He worked as a bank clerk in
Kurume, Fukuoka is a city in Fukuoka Prefecture, Japan. , the city had an estimated population of 295,367 in 137,140 households, and a population density of 1309 people per km². The total area of the city is . Geography Kurume is located in the Chikugo Plain ...
for about two years, and after resigning from the bank, he entered the underworld as a bakuto probationer at the age of around 20.''Document Kyushu Yakuza Wars'', "Person, Isoji Koga" (pp.228–240), Masaki Yasuda, December 1990, Seinen-shokan After retirement in 1992, Koga died at a hospital in Kurume on May 22, 2009. He was 74 years old. He was considered a historic godfather of the Dojin-kai. *Seijiro Matsuo,"Fukuoka yakuza turf war erupts"
May 23, 2006, ''
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''
the second president of the Dojin-kai. At that time during the ''Yama-Michi War'', Koga was in prison, and Matsuo took command of the Dojin-kai to fight with the
Yamaguchi-gumi is Japan's largest ''yakuza'' organization. It is named after its founder Harukichi Yamaguchi. Its origins can be traced back to a loose labor union for longshoreman, dockworkers in Kobe before World War II. It is one of the largest organized cr ...
.


References

{{Designated Boryokudan Organizations established in 1971 1971 establishments in Japan Yakuza groups based in Kyushu