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The practical premise of discussing 'domestic propaganda,' which is what Glenn is writing about, is that the Pentagon is treating the domestic population, the US population, the same way it treats targeted populations for info ops abroad. Now, we KNOW that info ops in war theaters include 'ideological warfare', and also that some activities traditionally more likely to be managed by CIA have been appropriated by the Pentagon. Rumsfeld created a whole division at the Pentagon, known among other things as P2OG, which was to appropriate certain types of tasks previously regarded as CIA responsibilities, including some false flag ops, which themselves had their explicit scope extended, to the point of performing fake terrorist strikes. So I think it's fair to assume that 'ideological warfare' against the domestic US population is part of the current Pentagon package, and hence, that some 'libertarians', theoretically, could be Pentagon agents of influence!
I got to admit though that Scott Horton is an excellent guy, I love his radio interviews. I can't imagine him being one of 'them'!