Yeah, so the first one says "The oppressed peoples of the whole world, under the banner of the Comintern, overthrow imperialism!" The second one says "Beat the Whites with the Red Wedge." As far as Constructivism goes, this is a good primer.

Outside of Constructivism, the Soviet film industry was extremely influential and experimental at times. Check out people like Eisenstein (who invented the montage) and Tarkovsky (who is one of the best filmmakers of all time).

The best socialist TV show I've ever watched is Dekalog, made right before the collapse of communism. Set in Poland, it's really a wonderful look at the lives of common people in late 20th century communist Europe, and very innovative.

I love this book of Chinese revolutionary poetry. Mao's "Snow" is an absolute banger.

Fiction-wise, I love Chevengur by Andrei Platonov and Red Star by Bogdanov.

Yugoslav synth pop is amazing and so much fun; it's more 80's than anything from the West.