Когда образовалась партия левых эсеров в России?
In 1917, the Socialist Revolutionary Party split between those who supported the Russian Provisional Government, established after the February Revolution; and those who supported the Bolsheviks, who favoured a communist insurrection. The majority stayed within the mainstream party, but a minority who supported the Bolshevik path became known as Left Socialist-Revolutionaries or Left SRs.
1917