Yee, a Democrat who represents parts of San Francisco and San Mateo County, and other suspects were arrested last week on a criminal complaint that outlined the charges behind the grand jury indictments. Yee was indicted on charges of corruption, wire fraud and gun trafficking, the same charges laid out in the complaint.

The indictment said Yee solicited campaign contributions from undercover FBI agents and promised political favors in return. The alleged favors included a letter of endorsement on Yee’s state Senate stationary and a state proclamation.

A grand jury indictment means the defendants will not be entitled to a preliminary hearing in which testimony would be taken and a judge would determine whether there was sufficient evidence for a trial.