socialist realism

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A Marxist aesthetic doctrine that seeks to promote the development of socialism through didactic use of literature, art, and music.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun art A Stalinist idealization of the dictatorship of the proletariat applied to art that used realistic techniques to show the struggle for socialism in a positive and optimistic manner