CHICAGO (AP) _ A seventh Chicago alderman was indicted Tuesday on charges of taking payoffs in the federal government's undercover sting operation called Silver Shovel.

Percy Z. Giles, 47, is expected to be the final City Council member indicted in the investigation, which went public three years ago, U.S. Attorney Scott Lassar said.

Giles said he is ``totally innocent'' but declined to comment further.

Six other Chicago aldermen have been indicted in the investigation in which an admittedly corrupt contractor, John Christopher, acted as a mole for the FBI and made 11,000 tape recordings of talks with politicians.

Five of them have been convicted.

Giles is charged with racketeering, extortion, mail fraud and filing false tax returns, among other charges. The indictment says he took $10,000 from Christopher in exchange for promising to help a Christopher company get business. A former Giles aide already in prison was also indicted.

In all, 18 people have been charged in Silver Shovel.