 Federal arrangements may protect against central authorities by securing immunity and non-domination for minority groups or nations. Constitutional allocation of powers to a member unit protects individuals from the center, while interlocking arrangements provide influence on central decisions via member unit bodies (Madison, Hume, Goodin 1996). Member units may thus check central authorities and prevent undue action contrary to the will of minorities: “A great democracy must either sacrifice self-government to unity or preserve it by federalism. The coexistence of several nations under the same State is a test, as well as the best security of its freedom … The combination of different nations in one State is as necessary a condition of civilized life as the combination of men in society” (Acton 1907, 277).