SAN FRANCISCO — A wave of arrests by federal agents on Wednesday nabbed State Sen. Leland Yee, who faces charges of public corruption and firearm trafficking, imperiling his bid for statewide office and threatening the Democrats’ stranglehold in Sacramento.

Yee, a San Mateo Democrat, headlined a 137-page criminal complaint unsealed in the U.S. District Court for the Northern District of California that charged 26 defendants with crimes that included firearms and weapons trafficking, money laundering, murder for hire, drug distribution and honest services fraud.