Pedro Flores, left, who testified Tuesday in the Brooklyn federal...

Pedro Flores, left, who testified Tuesday in the Brooklyn federal trial of alleged drug lord Joaquin "El Chapo" Guzman Loera, and his twin brother,  Margarito "Junior" Flores. Credit: Government Exhibit

He grew up in Chicago, the son of an often-imprisoned drug dealer, but after pursuing the family trade and distributing nearly $1 billion worth of cocaine for the Sinaloa cartel’s top leaders, Pedro Flores decided to turn on Joaquín “El Chapo” Guzmán Loera because he didn’t want to follow in his father’s footsteps.

Flores, testifying publicly for the first time Tuesday at Guzmán’s trial in Brooklyn federal court about how he came to flip on the alleged drug lord and make secret recordings for the DEA in 2008, said his shift was triggered by conflicts in the cartel that made his life as its primary U.S. distributor increasingly risky.

“My wife became pregnant in 2008,” he testified “. . . I couldn’t promise my family a tomorrow. I just wanted something better for my own family.”

Flores, 37, and his twin brother, Margarito “Junior” Flores, ran a sprawling distribution network out of Chicago that sent cocaine and heroin smuggled by Mexican traffickers to customers in cities from Minneapolis and Milwaukee to Columbus, Ohio, Philadelphia, Washington, D.C. and New York City.

More than a half-dozen informants have testified against Guzmán since the trial began last month, but they have all been Colombian suppliers or Mexican smugglers who were caught. Flores and his brother, also expected to testify, are the first American distributors, and the first to have turned themselves in.

Secret recordings of Guzmán are expected to be played in court Wednesday. In his testimony Tuesday, the boyish-looking Flores provided some of the trial’s most damaging testimony yet. He described a naked man chained to a tree on his first visit to Guzmán’s estate, and the alleged drug lord’s reaction when Flores said later he once feared the cartel might line men up and shoot them for fun.

“No,” a laughing Guzmán responded. “Only when we have to.”

TOPSHOT - This handout picture released by the Mexican Interior...

TOPSHOT - This handout picture released by the Mexican Interior Ministry on January 19, 2017 shows Joaquin Guzman Loera aka "El Chapo" Guzman (C) escorted in Ciudad Juarez by the Mexican police as he is extradited to the United States. Mexican drug baron Joaquin "El Chapo" Guzman, one of the world's most notorious criminals, was extradited to the United States on January 19, 2017 to face charges. - Pixelation of faces was done by the Mexican Interior Ministry / AFP PHOTO / INTERIOR MINISTRY OF MEXICO / HO / RESTRICTED TO EDITORIAL USE-MANDATORY CREDIT "AFP PHOTO/INTERIOR MINISTRY OF MEXICO" NO MARKETING NO ADVERTISING CAMPAIGNS-DISTRIBUTED AS A SERVICE TO CLIENTS-XGTYHO/AFP/Getty Images Credit: AFP/Getty Images/HO

Soft-spoken and speaking in English, Flores said he learned the drug trade by translating for his father and unloading shipments in Chicago. When their father and older brother were jailed, Flores testified, the twins, 17 at the time, took over. They set up multi-kilo shipments from two different middlemen — both, it turned out, linked to Guzmán — and gradually expanded from Chicago, he said.

In the early days, he said, the drugs were dropped off in a beaten-up Ford Econoline van left for him with keys at a Dennys outside Chicago. As they expanded, he said, they learned to put their stash houses to hold the drugs and count the cash in the “best neighborhoods,” like one in New York with “a beautiful view” of the Brooklyn Bridge.

“They were the ones law enforcement would be less suspicious of,” he said, and they provided more protection if rivals tried to break in and steal the stash. “The neighbors are a little more suspicious of things like that.”

After being indicted in the U.S. in 2004, he said, the twins moved to Mexico. They ran their distribution network by cellphone, and were able to parlay their reputation into a direct connection with Guzmán and cartel co-leader Ismael “Mayo” Zambada Garcia, he testified, distributing an estimated 38 tons of cocaine worth about $800 million from 2005 to 2008.

Flores was kidnapped himself once and held for 16 days by a disgruntled middleman before his brother got Guzmán — referred to by Flores regularly as simply “the man” — to intercede. Later, the twins’ father was kidnapped by the same man, he said, and Guzmán sent a crew of 25 to rescue him.

He scolded Flores for supplying the men with stolen cars to use in their raid. “No innocent people should take a loss because of something like this,” Guzmán said, according to the testimony.

But those scruples did not apply to targets of vengeance. After Flores’ father was rescued, he asked one of Guzmán’s henchmen what became of the kidnapper.

“He said he had suffocated him to death, by putting a plastic bag over his head,” Flores recalled.

Later, Flores told Guzmán he was worried because some friends claimed to have seen the kidnapper alive. “They’re seeing ghosts,” Guzmán responded. “Worry about something else.”

The ride came to an end in 2008 when a rival Mexican faction went to war with Guzmán and Zambada, both sides telling the Flores twins they couldn’t serve two masters. “They were both demanding loyalty and both saying I couldn’t do business with the other,” he testified. “. . . My life would be put in danger.”

Flores decided the only way out was to work with the DEA. He said he recorded Guzmán on a device he bought at a Radio Shack in Mexico and has since provided information on more than 50 people in his own organization and the cartel. Flores is nearing the end of a 14-year sentence for trafficking.

His testimony is expected to resume Wednesday.

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