 Voykov also was a member of the fighting squad of local social-democrats after moving to Yalta.Voykov was one of the five organizers and participants in the terrorist attack on July 20, 1906 against the local police chief, M. M. Gvozdevich.According to the official Soviet biography of Voykov, the initial purpose of the operation was not a terrorist act, but the transportation of bombs, prepared for self-defense, from a cache to a place outside the city, where they were planned to be discharged.