During the same period, he was indicted by a federal Grand Jury on charges of violating the Espionage Act and arrested.
Attending a rally for 600 striking dockworkers in San Pedro, California, in 1923, Hopkins was arrested on what is today known as Liberty Hill with Sinclair, Sinclair's brother-in-law Hunter Kimbrough, and Hugh Hardyman, who attempted to recite the First Amendment of the Constitution, or Free Speech Amendment [REF].