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That no man should have his own possessions or land, everything is to be shared, and that way classes are eliminated and no one is on top ( rich vs. poor ). However it still usually fails and someone is always on top.
I think you worded your question incorrectly; the word to the definition an absence of government is: Anarchy
Imperialism is basically a policy that extends a country's power and influence through a military force and/or a diplomacy.
Hope I helped!