The Chinese, Korean and Vietnamese gangs are linked to their community's social and economic life.
About half a dozen Vietnamese gangs, each with about 150 members, are believed to be active in the Berlin area.
"But the Chinese and Vietnamese gangs see this area as a golden goose" for extorting money from merchants.
Now there are also new problems, with the Vietnamese gang Born to Kill.
The gunmen, members of a Vietnamese gang, had held 38 hostages for eight hours.
A much bigger criminal challenge comes from Vietnamese gangs.
When they emerge from the fleet of dhows, the Vietnamese gang is no longer in evidence.
Vietnamese criminal gangs in the Czech Republic usually have a three-level structure.
And with all the Cambodian and Vietnamese gangs moving in, he's had his hands full keeping order.
By 2003, this area became known for crime and the known presence of Vietnamese criminal gangs and street drug peddlers.
