In the Vilna Ghetto, in January 1942, Vitka joined other youth to organize the Jewish resistance efforts into a larger collective called the United Partisan Organization, or FPO. Members of the FPO had to be from youth movements and “fit for armed underground action.” Vitka was responsible for the FPO's first act of sabotage: smuggling a homemade bomb out of the ghetto and blowing up a German train line. When carrying out resistance operations from within the ghetto became too difficult, the partisan group left to join larger partisan groups in the forest.