Russian peasants. The Left SRs presented itself as their main representative and sole defender of the populist program against the passivity of the moderate Socialist Revolutionary Party. The reforms they led during the first months of 1918 gave the government significant support in the countryside.

Spiridonova, surrounded by delegates of the Second Congress of Peasant Soviets, at the end of 1917.

Negotiations with Central Empires in Brest-Litovsk. The Left SRs opposed the conditions imposed by the imperialist powers, rejecting the peace treaty and withdrawing from the coalition government with the Bolsheviks.

Mark Natanson, a respected old revolutionary leader, one of the founders of the Circle of Tchaikovsky, Land and Liberty and the Socialist Revolutionary Party. In 1917 he became the noble inspirer of the Left Socialist-Revolutionaries, but in 1918 he joined the new Party of Revolutionary Communism