Background
A Bolshevik group led by Kamo attacks a cash transport in Erivansky Square with explosives and firearms to fund the party. People are killed and injured, including bystanders. Biographies connect Stalin with the preparations and clandestine network; his exact presence and operational role remain disputed. The robbery illustrates violent revolutionary 'expropriations', which were also opposed within the movement. 26 June is the Gregorian date, corresponding to 13 June in the Russian calendar then in use.
Sources: Young Stalin (2007) · Stalin: Paradoxes of Power, 1878–1928 (2014)