This video should be required watching for anyone on /32/. A concise and articulate (and humorous) overview of the methods of political subversion from a Soviet defector.
His thesis is that ideological subversion of a culture happens in four stages: demoralization, crisis, normalization and destabilization, after a which a foreign power will assume power via civil war or invasion. He states that this process is legitimate and open and happens in the full view of the public, if one cares to notice it.
He emphasis that the entire process can be thwarted as the first stage if the people have sufficient strength of spirit and moral character to resist the initial demoralization and destruction of their identity.
A link to a blogpost with more links regarding Bezmenov's life and thought: http://www.maledefender.com/yuri-bezmenov/