The office revealed that the indictment follows an extensive investigation and surveillance of the ring, which included the use of wire taps.
Investigators claim that the ring generated millions of dollars in US wagers and extended to loan sharking. All thirteen defendants pleaded not guilty to the indictment before Judge Danny Chun.
The leader of the ring is believed to be Salvatore DeMeo, an individual who was already a fugitive from justice facing unrelated criminal charges. He was released on bail of $300,000 after his legal representative pleaded that he has a health problem.