The Ba Ria-Vung Tau police arrested 70 people, including the organizers, after catching gamblers red-handed at a hotel belonging to a local police officer Sunday.
They made the arrests at Hoang Phuong 2 Hotel in Tan Thanh District and seized more than VND1.2 billion (US$53,600) from the spot.
The organizers were Dang Van An, 53, his wife Nguyen Thi Dung, 33, and his two brothers Dang Van Xa, 43 and Dang Van Nhan, 40.
An confessed to renting the hotel to organize the gambling in two large rooms.
He has posted guards and installed cameras around the hotel to detect possible police raids.
Dung had the job of collecting fees from gamblers, who could wager up to VND2 million.
The police had first noticed suspicious signs of the gamblers several months ago.
A police officer, who wanted to remain unnamed, said the gamblers were from Ba Ria-Vung Tau, Dong Nai, and Ho Chi Minh City.
An used to organize cock fights in a rubber plantation before moving to Hoang Phuong 1 Hotel.
He moved to Hoang Phuong 2 a month ago, the officer said.