 Complete the following phrase:  Like many Cheka employees at the time, Blumkin was, politically, a Left Socialist-Revolutionary rather than a Bolshevik. Since this party was opposed to the Treaty of Brest-Litovsk, Blumkin was ordered by its executive committee to assassinate Wilhelm von Mirbach, the German ambassador to Russia; they hoped by this action to incite a war with Germany. This event was timed to occur at the opening of the Fifth All-Russian Congress of Soviets at the Bolshoi Theater in Moscow. On the afternoon of 6 July 1918, Blumkin  along with an aide, Nikolai Andreyev  went to the residence of the German Ambassador on Denezhny Lane. Blumkin gained entrance to the embassy by presenting forged documents. When Mirbach entered the drawing room, Blumkin pulled a gun from his case and shot the ambassador at point blank range, killing him. At the same time, the Left SRs launched 