Altruistic suicide is sacrifice of one's life to save or benefit others, for the good of the group, or to preserve the traditions and honor of a society. It is always intentional. Benevolent suicide refers to the self sacrifice of one's own life for the sake of the greater good. Such sacrifice may be for the sake of executing a particular action, or for the sake of keeping a natural balance in the society. It is a theme or concept of a custom of sacrifice typically found within certain types of science fiction stories. However, real examples of these customs have been recorded to exist among some indigenous people, such as certain Inuit tribes. This was seen by Émile Durkheim in his study Suicide as the product of over-integration with society.