Photograph by Jan Van Raay who holds the copyright.
Although Jan says this is a photograph from a demonstration by the Black Cultural Coalition in 1971 but I think it is actually a picture of a demonstration of Feminist Artists protesting the exclusion of women from previous Whitney Biennales in maybe 1969. It is possible to check Faith's autobiography WE FLEW OVER THE BRIDGE, republished by Duke University Press, 2004.
We certainly look happy!