Anti-Mushroom Kingdom propaganda from the Koopa Kingdom.
I tried to make up a symbol for the flag that vaugely looks like the one on the original Super Mario Bros ( [link] ), incorporating the honeycombed hexagon pattern of a koopa shell. Someone told me afterward that it was supposed to be a skull on the flag… Oh well.
The base for the first one is a famous old WWII American poster ( [link] ), and the second is just a photo of good ‘ol Joe Stalin.