However, Social-Democratic 'Liquidators' like Liber had counterparts among the Socialist-Revolutionaries, including Liber's contemporary A.R. Gots. Liber's subsequent close alignment with Gots in 1917 may have had its roots in their common 'Liquidationism' of the 1910s. During this period, Liber married, which may also have encouraged his emphasis on legal work. In 1914, Liber at first opposed the First World War and took a moderate 'Internationalist' position. However, after the February Revolution of 1917, Liber called for war 'in defence of the revolution' and took up a 'Revolutionary Defencist' position. As a representative of the Bund and the Mensheviks, Liber played a major role in the soviets. He collaborated closely with Menshevik and SR 'Revolutionary Defencists' like F.I. Dan, I.G. Tsereteli, A.R. Gots, V.M. Zenzinov and N.D. Avksentiev - so closely that his name was often linked in Bolshevik propaganda with those of Dan and Gots, in a pun on the German phrase "Dann lieber Gott!" ('then, dear God!), as "Danlibergots". Liber was a staunch supporter of Alexander Kerensky's Provisional Government, although he declined an offer to join the cabinet, preferring to concentrate on his work in the soviet. He represented the Bund in the Executive Committee of the Petrograd Soviet and was a member of the Presidium of the Central Executive Committee of the All-Russian Soviet. As such, Liber opposed not only the Bolsheviks but also Menshevik Internationalists like his old comrade Martov. Liber opposed the October Revolution of 1917 and rejected the position taken by the Mensheviks and many Bundists, which called for negotioation with the Bolsheviks for the purpose of forming an all-socialist coalition government. This proposal then had considerable support among Mensheviks, SRs and even some Bolsheviks (such as L.B. Kamenev), to Lenin's great annoyance. Nothing came of it beyond a brief cooperation of the Left SRs with the Bolsheviks. Liber, for opposite reasons, agreed with Lenin that a unity government uniting the Bolsheviks with the moderate socialists they had just overthrown was politically impossible and would destroy the revolution. In taking this view, Liber parted ways with Dan, who had gone over to Martov's Menshevik Internationalists and eventually migrated to the far left of the Menshevik party.