Stalnojs is the former head of Solidarity, a youth organization associated with political party For Human Rights in a United Latvia (now Latvian Russian Union), which organized protests against reforms in Russian schools and later became the youth branch of the party.
Tolaik viņš vadījis ar partiju "Par cilvēka tiesībām vienotā Latvijā" (PCTVL, tagad - Latvijas Krievu savienība) saistīto jauniešu organizāciju "Solidaritāte", kas organizēja protestus pret krievu skolu reformu un vēlāk pārtapa par PCTVL jaunatnes nodaļu.