Socialist Realism is a style of art that was developed in the Soviet Union in the Stalinist era and remained the official style of the Soviet bloc between 1932 and the breakup of the USSR in 1991.  Socialist realism typically depicted a highly idealized version of workers’ lives under Communism. Web resource here.

Victor Karrus and Roman Treuman. Call to Socialist Competition for the Republic’s Tractorists. Oil on canvas. 1951. Art Museum of Estonia, Tallinn.