Lalayants was an active participant in the Russian Revolution of 1905. After the Third Party Congress, he is co-opted into the Bolshevik Central Committee, and on the instructions of Lenin, he unites a whole series of Party committees and instructs them. In 1906, as a member of the Central Committee, Lalayants leads a great deal of work in military organisations. After a short stay abroad (at the beginning of 1906), he works in St. Petersburg for the Narva outpost; as a member of the Petersburg Committee, he edits its organ-newspaper "Kazarma". Lalayants is one of the main organisers and chairman of the first conference of the military organisations of the party in Tammerfors, where he makes a report on the role of the party in the armed uprising. Lenin closely follows the progress of the conference, giving a positive assessment of his work.