The Bolshevik/Left SR coalition was short-lived. Although Kamkov supported the Left SRs' participation in the Russian delegation in the peace negotiations with Imperial Germany at Brest-Litovsk, he was appalled by the harsh conditions imposed on Russia by the Treaty of Brest-Litovsk, fearing that it would suffocate the Russian Revolution. Along with some 'Left Communists', the Left SRs called for rejection of the Treaty. The 'Left Communists' were eventually brought to heel, but in March 1918, the Left SRs resigned from the Soviet government in protest against the peace treaty. Soon afterward, following the so-called 'Left SR uprising', they were expelled from the soviets (the other socialist parties had already been expelled earlier, over the protests of the Left SRs). Kamkov was involved in many of the activities of the Left SRs over the next few months: organising resistance to the Brest-Litovsk Treaty and to the Bolshevik policy of forced grain requisitions, holding merger talks with the 'Socialist Maximalists' and Ukrainian revolutionary groups.