By mainstream I mean uncorrupted by subsequent political corruption, I mean the classic definition, as wrought by the original practitioners.
So: anarchy (n.) 1530s, from French anarchie or directly from Medieval Latin anarchia, from Greek anarkhia "lack of a leader, the state of people without a government" (in Athens, used of the Year of Thirty Tyrants, 404 B.C., when there was no archon), noun of state from anarkhos "rulerless," from an- "without" (see an- (1)) + arkhos "leader" (see archon).
So, literally "Leaderless". If you hear someone call it Libertarian Communism you can tell THEM they're the victims of the hegemonic processes of the dominant elites, because the original definition's got fuck all to do with communism or libertarianism.
Also:
http://www.theihs.org/what-libertarian
Again, fuck all association with either left or right other than through those later elements which have found it expedient to cherry pick to suit their own dogma.
So thanks for the lesson, but I've always declined to pay much attention to old, poorly spun hash from the likes of Marx, et al.
Your interpretations are so far bent by your wishes as to be factually in error.
Most people's are.
But most people don't teach their own slightly mangled interpretations of the meaning of lif.
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