If there’s a lesser-known corner of San Francisco history, chances are Chris Carlsson has peeked into it. The historian, author, director of Shaping San Francisco and co-director of the history archive FoundSF is particularly interested in the city’s labor movements. Signs of those movements can still be spotted across the urban landscape, he says — if you know where to look.

On Nov. 1, Carlsson will lead a free, two-hour bike tour on San Francisco’s labor history as part of the Wattis Institute’s six-month-long research program “ Labor is on our mind .” Not only is this a labor-ful way to hit even more historically significant spots, Carlsson has bike bona fides: He helped co-found Critical Mass in 1992.

The tour will kick off at Mission Dolores and end at the Wattis. (Carlsson

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