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. 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 After World War I was over, divisions over the war could not be healed. Many internationalists wanted nothing to do with the Defencist leaders of the old Second International. Some affiliated with Lenin's communist Third International. A minority, who opposed both communism and the Second International leadership, formed the International Working Union of Socialist Parties, based in Vienna