Budapest, 1919. This was the year Hungary had its own Soviet-style revolution, led by the communist Béla Kun. The revolution quickly collapsed when Romania invaded Hungary a few months later. Kun escaped to the Soviet Union, where he was eventually executed in the 1930s as a "Trotskyite". I'm not sure if this photo is of Kun himself, but it certainly has a revolutionary feel about it.
Source: Fortepan [295940] / Kieselbach Galéria

