Noah Berger, Special To The Chronicle / /

A 28-year-old former East Bay community college professor was arrested for a brutal bike-lock attack amid a clash between President Trump supporters and radical left demonstrators last month in Berkeley, officials said Thursday.

Video of the April 15 assault exploded on right-wing websites in the days following the clash as scores of cybersleuths began identifying Eric Clanton as the masked man seen bashing a Trump backer in the head, causing serious bleeding.