Tuesday morning's announcement follows the charges filed recently against three people tied to San Francisco City Hall.
RELATED: SF city employees in court facing public corruption charges
They include political consultant and former school board president Keith Jackson, who has already pleaded guilty to racketeering charges in a separate federal case.
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Prosecutors claim all three suspects were taped receiving bribes by an undercover FBI agent.
Stay with ABC7 News for the latest details on this developing story.