Who are these two figures involved in the revolution in Hungary after the first world war?
Google search revealed that the one on the left is Sándor Garbai.
The one to his right seems kind of similar to an individual named Béla Kun, but I am not fully sure.
[EDIT]: This Wiki page on Béla Kun has same image (from different angle I suppose), and its caption says "Sandor Garbai and Bela Kun, leaders of the Hungarian Soviet Republic, 1919". So I believe he is Béla Kun.