More than three years after a political rally and counter-protest turned violent in the streets of Pacific Beach, a trial linked to that bloody day began Tuesday in San Diego Superior Court in what extremism experts have described as the first ever prosecution alleging an “antifa” conspiracy. A prosecutor told the jury during opening statements that the two trial defendants, Brian Cortez Lightfoot, 27, and Jeremy Jonathan White, 41, were self-described anti-fascists who showed up prepared to attack their political enemies at the Jan. 9, 2021, “Patriot March” organized by supporters of then-outgoing President Donald Trump. Defense attorneys told the...