The purpose of the organization was enumerated by Fidel Castro in his Havana Declaration of 1979 as to ensure "the national independence, sovereignty, territorial integrity and security of non-aligned countries" in their "struggle against imperialism, colonialism, neo-colonialism, racism, and all forms of foreign aggression, occupation, domination, interference or hegemony as well as against great power and bloc politics." The countries of the Non-Aligned Movement represent nearly two-thirds of the United Nations' members and contain 55% of the world population. Membership is particularly concentrated in countries considered to be developing or part of the Third World, though the Non-Aligned Movement also has a number of developed nations.