 Libertarian philosophy generally regard concentrations of power as sources of oppression that must be continually challenged and justified.Most libertarian socialists believe that when power is exercised as exemplified by the economic, social, or physical dominance of one individual over another, the burden of proof is always on the authoritarian to justify their action as legitimate when taken against its effect of narrowing the scope of human freedom.Libertarian socialists typically oppose rigid and stratified structures of authority, be they political, economic, or social.