This propaganda poster is meant to appeal to the workers, and entices them to give their all to help society build itself a new, better world. The picture in the background is a painting I found on the internet of the "Palace of the Soviets", a superstructure meant to house soviet congress in Moscow near the Kremlin. It was started in 1937, but scrapped in 1941 when Germany invaded. Construction never resumed.
Another great poster!
comrade