The schism caused splits in many European socialist parties. In France, the split between socialists and communists did not occur until 1920. In Germany, the
Independent Social-Democrats (USPD) formally separated from the majority
Social Democratic Party of Germany (SPD) in 1917, and the more radical
Spartacist League formed the nucleus of the post-war
German Communist Party (KPD). Italy was a special case: whereas, in most European socialist parties, Defencists predominated (at least at the beginning of the war), in Italy, the majority of the members and most of the leaders of the
Socialist Party, from reformists to radicals, were against Italy's entry into the war, while a minority, led by the former Maximalist and future
fascist dictator
Benito Mussolini, campaigned for Italian
intervention and was expelled from the party for it. Only the Serbian socialists remained fairly uniformly anti-war. The debate over
conscription in Australia caused the
Australian Labor Party split of 1916.
Russia Divisions in Russia were especially complicated and affected party alignments during the
Russian Revolution. The Mensheviks and Socialist-Revolutionaries were badly divided. A small minority on the right took an out-and-out Social Patriotic stance, even supporting territorial expansion as a war aim. Plekhanov and the 'Grandmother of the Revolution, Breshkovskaia, belonged to this group. Slightly more moderate were Mensheviks like
Aleksandr Potresov and SRs like
Vadim Rudnev. The Menshevik and SR majority, including Dan, Tsereteli,
Abramovich,
Liber, Gots, Avksentiev,
Zenzinov and so on, were 'Revolutionary Defencists'; they had been Zimmerwaldists and opponents of the war until February 1917 but now favoured limited defensive war. Some later returned to the Internationalist camp (such as Dan and Abramovich). The Revolutionary Defencists dominated the soviets and the
Provisional Government until the
October Revolution of 1917. The Menshevik/SR Revolutionary Defencists in the soviet supported the Provisional Government, but with increasing misgivings. Kerensky had been one of them, a Zimmerwaldist until 1917, then a Revolutionary Defencist; however, as, initially, the only socialist in the Provisional Government, he had adopted a more and more unqualified stance in support of the war, in line with his liberal colleagues. and
Leo Deutsch leading the demonstration in favor of the June military offensive in front of the Defense Ministry in Petrograd, June 1917 To the left of the revolutionary defencists stood Internationalists like Chernov, who collaborated with the soviet leaders and even joined the Provisional Government, although he opposed both a continuation of the war and a coalition with the liberals. More principled in his opposition to the war was the Menshevik Internationalist leader Martov, who, however, was in a minority in his party until the Bolsheviks had taken power. The
Mezhraiontsy group, headed by
Leon Trotsky, was firmly internationalist but not necessarily revolutionary defeatist; in 1918, Trotsky resigned his ministry rather than sign the harsh peace agreement of Brest-Litovsk proposed by the Germans. The
Left Socialist-Revolutionaries, who counted the veteran
Mark Natanson and many young militants among their number, were also firmly Internationalist but broke their short-lived coalition with the Bolsheviks when the latter signed the
Treaty of Brest-Litovsk. The Bolsheviks were fairly united in opposing the war, but not all Bolsheviks were comfortable with Lenin's Revolutionary Defeatism. Before Lenin's return to Russia,
Joseph Stalin had even briefly adopted a Revolutionary Defencist position. Divisions over the war vitiated the attempts occasionally made, both before and after the October Revolution, to set up an all-socialist government, from the Bolsheviks to the
Popular Socialists. == Post-war impact ==