Saturdays volunteers on the 1st of May, Kremlin (s.d.) (14827313132)

Boris Souvarine Papers - Soviet Russia Photos
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Notes: The back of the document holds the mention (in Russian): "May 1st. Subbotniki in the Kremlin". A subbotnik was a volunteer worker on Saturdays.
Unknown photographer.
Description: 1 photograph. Black and white ; 9 x 12 cm.
Sources and further reading:
Siegelbaum, Lewis H., and Ronald Grigor Suny. 1994. Making Workers Soviet: Power, Class, and Identity. Ithaca, N.Y.: Cornell University Press.

Von Geldern, James. 1993. Bolshevik Festivals, 1917-1920. Berkeley: University of California Press. (Chap. "Labor transformed", pp. 151-156).