SAN FRANCISCO — Authorities here are set to announce that at least eight people have been charged with federal offenses in connection with a drug trafficking investigation into sales at the Tenderloin neighborhood, court records show.

The charges include a multi-defendant case that includes several members of the same family who are accused of selling fentanyl by the ounce to Tenderloin drug sellers. The charging records allege that they discussed drug sales on phone calls and text message conversations that were wiretapped by federal authorities, and that they sold thousands of counterfeit pain pills and 10 ounces of heroin to an undercover agent working for the Drug Enforcement Administration.

The criminal complaint alleges that last October, the lead defendant, Emilson “Playboy” Cruz Mayorquin, traveled from his Oakland home to the San Francisco library to sell fentanyl and that one of his co-defendants, Pamela Carrero, sold 1,000 counterfeit pills containing fentanyl to the undercover agent last September, for $8,000.

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