In the Fallout world, The Enclave is a paramilitary organization and quasi-state dedicated to the project of an all-inclusive holocaust of non-members, whom they dehumanize as "genetic non-compliance offenders." It is the direct continuation of a pre-War American deep state organization consisting of high-ranking political, military, and corporate figures.It claims to be the direct continuation of the United States and its government, despite seizing power by subverting continuity of government protocols and murdering non-Enclave government survivors in the name of continuing the war against the concept of communism.

From source: Fallout fandom-wiki