TOKYO (Reuters) - With her dyed-brown long hair and tight designer jeans, Shoko Tendo looks like any other stylish young Japanese woman -- until she removes her shirt to reveal the vivid tattoos covering her back and most of her body.

Shoko Tendo author of "Yakuza Moon" poses after an interview with Reuters in Tokyo August 28, 2007. Tendo, 39, the author of "Yakuza Moon", a best-selling memoir just out in English, says that police efforts to eradicate the gansters have merely made them harder to track. REUTERS/Kim Kyung-Hoon

The elaborate dragons, phoenixes and a medieval courtesan with one breast bared and a knife between her teeth are a symbol of Tendo’s childhood as the daughter of a “yakuza” gangster and her youth as a drug-using gang member.

The author of “Yakuza Moon,” a best-selling memoir just out in English, the 39-year-old Tendo says that police efforts to eradicate the gangsters have merely made them harder to track.

“The more the police push, the more the yakuza are simply going underground, making their activities harder to follow than they ever were before,” she told Reuters in a recent interview.

Police say full-fledged membership in yakuza groups fell to 41,500 last year, down from 43,000 in 2005, a decline they attribute to tighter laws against organized crime.

The number of yakuza hangers-on, including thugs and members of motorcycle gangs, who are willing to do their dirty work, though, rose marginally to 43,200.

More shocking for many in Japan, where gun-related crime is rare, were a handful of fatal shootings by yakuza earlier this year, including the killing of the mayor of Nagasaki.

Tendo said the shootings were a result of the legal crackdown on yakuza, which has made it harder for them to ply their traditional trades of prostitution, drugs and bid-rigging.

“They’re being forced into a corner, their humanity taken away,” she said. “All the things they used to do for a living have been made illegal, so life has become very hard.”

SOCIAL DISPARITY

Experts say this is especially true for gangsters in less affluent parts of Japan, a reflection of the same sort of income gaps that increasingly plague the nation as a whole.

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“Yakuza need a lot of money, but depending on where they are, business isn’t going so well,” said Nobuo Komiya, a criminology professor at Tokyo’s Rissho University. “So they turn to guns.”

Descended from medieval gamblers and outlaws, yakuza were long portrayed as latter-day samurai, bound by traditions of honor and duty and living extravagant lives.

Tendo’s father, the leader of a gang linked to the Yamaguchi-gumi, the largest yakuza group, led a “classic” yakuza life replete with Italian suits, imported cars and a Harley-Davidson motorcycle.

Raised with strict ideas of honor, she was both spoiled and scolded by the tattooed men who frequented her family home.

But she also faced prejudice and bullying because of her father. In response, she joined a gang, took drugs and become the lover of several gangsters before near-fatal beatings and drug overdoses convinced her to change her life.

Now a writer and mother, Tendo has distanced herself from the yakuza world, which she feels is rapidly losing its traditions.

Being a gang member is not illegal in Japan, and until recently the gangs were known for openness. Their offices even posted signs with their names and membership lists inside.

Gangs cooperated with police, handing over suspects in return for police turning a blind eye to yakuza misdemeanors, but this broke down after organized crime laws were toughened in 1992.

AGEING GANGSTERS

The largest part of yakuza income now comes from pursuits involving stocks, property and finance.

“What we’re going to see from here on is the yakuza becoming more structured, like the U.S. Mafia, and dividing itself between business experts and violence experts,” said Manabu Miyazaki, a writer whose father was also a yakuza.

“As the world becomes more borderless, they’ll need experts who can deal with this too, speaking Chinese and English.”

Like Japan as a whole, gangsters are also ageing, and fewer young people look to organized crime as a career option.

Police figures showed fewer than 20 percent of yakuza were in their 20s in 2005, a trend both Tendo and Miyazaki attributed to young people’s dislike for the tough life involved.

“They think being a yakuza is like joining a company,” Miyazaki said. “There’s a joke about a young man going to a gang office and asking what the salary was, and would he get insurance.”

But while today’s yakuza are eschewing tattoos and amputated fingers -- cut off to atone for mistakes -- in favor of more mainstream lifestyles, they are unlikely to disappear altogether.

“Fewer people want to become yakuza,” Miyazaki said. “But those who do will be very logical, very scary -- and much, much more dangerous.”