State Senator Leland Yee has been indicted for public corruption as part of another major FBI operation. San Francisco Police Chief Greg Suhr described the raids to KCBS as “massive.” “Hundreds of officers are involved in this,” he said.

Yee was taken into San Francisco’s Federal Building wearing handcuffs FBI agents and local police are serving arrest and search warrants throughout the Bay Area, with agents seen in locations in San Francisco and San Mateo, as well as Yee’s Capitol office in Sacramento. Targets of the raid are expected to appear in federal court in San Francisco this afternoon. Yee’s indictment likely ruins his candidacy for Secretary of State, and threatens Democrats’ ability to restore the state Senate supermajority that already has been broken by two other lawmakers’ paid leaves of absence to deal with criminal charges.

Yee represents San Francisco and a portion of San Mateo County. Before becoming the first Chinese-American ever elected to the state Senate in 2006, Yee was an Assemblyman from 2002 to 2006; a San Francisco supervisor from 1997 to 2002; and had been a member and president of the San Francisco Unified School District board. While in the Assembly, he was the first Asian-American to be named Speaker pro Tempore, essentially making him the chamber’s second-most-powerful Democrat.

Yee is the state’s third Democratic legislator recently tied to corruption allegations. In February, State Sen. Ron Calderon, D-Montebello, surrendered to authorities after being indicted on bribery charges surrounding proposed workers’ compensation law and Pacific Hospital in Long Beach. In January, Assemblyman Roderick Wright, D-Inglewood, was convicted of voter fraud and perjury stemming from a 2010 indictment.

Derek Cressman, who until last June was vice president of the non-partisan government watchdog group Common Cause, issued a statement Wednesday morning saying that Yee’s indictment must be “a wake-up call” given other Senate Democrats’ criminal charges. “We are clearly beyond the point of looking at one bad apple and instead looking at a corrupt institution in the California senate,” Cressman said. “The constant begging for campaign cash clearly has a corrosive effect on a person’s soul and the only solution is to get big money out of our politics once and for all.”