One of the men who authorities say was at the center of a scam to use a veterans charity as a front for an illegal gambling operation worth nearly $300 million was a well-known attorney who once ran a marathon in a suit as a publicity stunt.

Another man involved in the case was described by friends as a small-town “pool hustler” in South Carolina. Jacksonville attorney Kelly Mathis was identified by authorities as the man at the center of the alleged racketeering scheme. Two other men charged as co-conspirators had experience running gaming parlors, including Johnny E. Duncan, who was charged more than 20 years ago with creating a fake charity to sponsor bingo gaming, which allowed the games to operate tax-free. The other man, Jerry Bass, had previously worked as general manager of a video poker parlor in South Carolina.

Authorities said Mathis made about $6 million from the operation. During a news conference Wednesday, Florida Attorney General Pam Bondi unveiled a poster with a photo of Mathis in the center and linked to dozens of alleged gambling operations. Officials said he was the registered agent for 112 businesses related to the investigation. Nearly 60 people have been arrested so far.