Stencils painted in Mexico City during the commemoration demonstration of the Tlatelolco massacre.
The massacre of hundreds of student protesters by cops and soldiers occurred 10 days before the opening of the 1968 Summer Olympics in Mexico City.
Huge mural in St Petersburg in commemoration of the Kronstadt uprising, an anti-Bolshevik revolt led by revolutionary sailors which broke out on March 1st 1921.
The mural says "Death to the Bourgeoisie" using the design of the Kronstadt rebel flag.