Remembering a police riot: The Castro sweep of October 6, 1989.

Scene from the Castro Sweep Police Riot of October 6, 1989 with police arresting Gilbert Criswell at the corner of Castro and 18th Streets. (Photo: Rick Gerharter)

The Burton Federal Building is a bleak gray high-rise of glass and granite, an exemplar of Cold War modernism that marks a divide between the Beaux Arts ostentation of San Francisco’s Civic Center and the gritty Polk and Tenderloin neighborhoods…