Flashback Friday.

This series of pictures is from a San Francisco Chronicle article about flash mobs, or “an international fad, partly anarchistic, partly absurdist, in which a mob of participants suddenly materializes at a public place, engages in odd behavior [like pillow or shaving cream fights] and then disperses.”

One picture is of Martin Condol, one of the city workers brought it to clean up after the revelers. He is the only worker to be included in the photographs — appearing in two images of the 20 — despite the fact that the article was specifically about the problem and expense involved in cleaning up.

Though many of us see such workers in our everyday lives, they are very rarely made visible in news accounts of the world. Even when they’re relevant, news producers seem to prefer to show the faces of happy white people to those of the men and women whose hard work keeps cities, businesses, and families flourishing.

Originally posted in 2009.

Lisa Wade, PhD is an Associate Professor at Tulane University. She is the author of American Hookup, a book about college sexual culture; a textbook about gender; and a forthcoming introductory text: Terrible Magnificent Sociology. You can follow her on Twitter and Instagram.