Egalitarianism
Egalitarianism is a school of thought within political philosophy that builds on the concept of social equality, prioritizing it for all people. Egalitarian doctrines are generally characterized by the idea that all humans are equal in fundamental worth or moral status. As such, all people should be accorded equal rights and treatment under the law. Egalitarian doctrines have been important in many modern political philosophies and social movements, including the Enlightenment, classical liberalism, libertarianism, feminism, civil rights, and international human rights. Egalitarianism is a major principle of both classical liberalism with its equality of rights, and redistributive left-wing politics with its stress on equality of outcome.
Read more on Wikipedia