The film tells about the All-Union communist subbotnik on April 15, 1972 in Moscow. The film uses the following footage: a meeting of workers at the Moscow-Sortirovochnaya depot, a participant in the first subbotnik Kondratyev speaks. The main conveyor of the Lenin Komsomol automobile plant; weavers of the Paris Commune factory in the shop at work; watch assembly conveyor; Muscovites cleaning streets and squares; schoolchildren collect scrap metal and waste paper; workers of the Moscow vegetable farm "Marfino" collect cucumbers; construction of a residential building; steel-making shop of the "Serp and Molot" plant; presenting gifts to labor veterans and the best young workers of the 2nd watch factory.