Everyone knows the first rule of Fight Club: You don’t talk about Fight Club.

But there’s a former Bexar County Jail inmate who’s breaking that rule — legally.

The one-time inmate who is now serving time in state prison has filed a federal civil rights lawsuit, alleging that several detention officers at the Bexar County Jail organized brawls between inmates and bet on the outcome, leaving some inmates bloodied in the aftermath.

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Rodolfo Carrazco alleges he was subjected to the underground blood sport while he served a stint at the jail in April 2017 and was beaten seriously enough that he had to be hospitalized with injuries that included a broken jaw. He also lost the gold “grille” in his teeth.

“They would let guys loose to fight each other,” said Carrazco’s lawyer, Gregory W. Canfield. “What our investigation shows is that they were betting on who was going to win.”

Carrazco, also identified as Rodolfo Carrasco in court and police records, is serving a 14-year sentence in the Texas prison system for charges that include burglary of a habitation. He was transferred there in November 2017 after being sentenced in Bexar County, records show. While awaiting trial and sentencing, Carrazco was held at the Bexar County Jail.

The lawsuit said deputies unlocked the cells of the housing unit where Carrazco was held and allowed other inmates to challenge him to a fight. The suit, filed Monday with Bexar County as the defendant, seeks unspecified compensatory and punitive damages for pain, mental anguish and the loss of Carrazco’s gold “grille.”

“Mr. Carrazco was messed up pretty bad,” Canfield said. “It was like a fight club. Several inmates and several guards were involved in it.”

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According to Canfield, the fights occurred while supervisors were not around or in areas of the jail where surveillance cameras might not have recorded the incidents. Reluctant inmates were coerced to defend themselves, and talking about the fights was a no-no, according to Canfield.

“I believe they were egged on,” Canfield said. Inmates had to fight back “if you have someone attack you.”

The lawsuit does not identify any of the deputies involved, the number of fights, or how long the alleged “fight club” lasted. It was unclear whether the Bexar County Sheriff’s Office has investigated the matter, although then-jail Deputy Raul Gonzales was fired in December 2017 after he was accused of organizing fights between inmates.

Gonzales came under investigation after KENS-TV received complaints from inmates’ families beginning in April 2017. The KENS report, however, did not mention a “fight club” or allegations that deputies bet on fights.

At a news conference Wednesday, Sheriff Javier Salazar addressed a number of unrelated incidents of alleged wrongdoing by deputies that “came to a head this week” — from drunken driving offenses to assault of inmates. Some deputies were terminated, while others were informed they were being shown the door, Salazar said. He explained the internal disciplinary process, typically two separate administrative and criminal investigations, and steps he has implemented to help curb misdeeds by deputies.

He told reporters that he does not tolerate misconduct by any of the 1,500 employees he oversees.

“Several months ago, I stood in this very spot and indicated and have made no bones about it, that if you are caught dishonoring this badge, I will make it a point to hunt you down and cut you off like a cancer,” Salazar said.

He said he had not heard of recent allegations of a “fight club” within his office’s ranks.

“The last case that I heard that term ‘fight club’ associated with was a case from several years ago, before I took office, and my understanding is that person is no longer employed here,” said Salazar, who was sworn into office Jan. 1, 2017.