Left Socialist-Revolutionaries

The Party of Left Socialist-Revolutionaries-Internationalists (Russian: Партия левых социалистов-революционеров-интернационалистов, romanized: Partiya levykh sotsialistov-revolyutsionerov-internatsionalistov) was a revolutionary socialist political party formed during the Russian Revolution. 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 the overthrow of the Provisional Government and the placing of political power in the hands of the Congress of Soviets.

Source: Wikipedia — Left Socialist-Revolutionaries (CC BY-SA 4.0)