With a high number of excess deaths occurring under his rule, Stalin has been labeled "one of the most notorious figures in history." These deaths occurred as a result of collectivisation, famine, terror campaigns, disease, war and mortality rates in the Gulag. As the majority of excess deaths under Stalin were not direct killings, the exact number of victims of Stalinism is difficult to calculate due to lack of consensus among scholars on which deaths can be attributed to the regime.