Всероссийское учредительное собрание
Averin was a member of the All-Russian Congress of Soviets, the All-Russian Central Executive Committee, and the Russian Constituent Assembly. Along with Yakov Peters, Felix Dzerzhinsky and others, he was a member of the original Cheka. In December 1917 Averin was appointed in charge of the military revolutionary headquarters of the Yekaterinoslav Soviets and actively participated in the Yekaterinoslav Bolshevik Uprising.