A film about the communist subbotnik in Moscow on April 19, 1975. Moscow city. Kalinin Avenue. Musicians. The first subbotnik. Steam locomotive repair. Spinning and weaving shop. Statistical Office. Counting machine. Cotton-paper mill. Frunze. Subbotnik participants clean the streets, plant trees. Moscow Food Factory. Conveyor. Workshop of the "Manometer" plant. Rot-Front confectionery factory. Candy boxes. Muscovites are digging lawns, asphalt roads. Electric plant workshop. Coal mine. TV store. Refrigerator plant. Construction of institutes: gynecology and obstetrics, cardiology. Artists of the Maly Theater in the workshop of the Hammer and Sickle plant. The workers are greeted by M. Tsarev. I. Lyubeznov speaking.