Here is a relevant article:
The Leftist 'Purification' Movement
American Thinker, by Andrew Thomas
Posted 6/25/2010 2:23:32 AM
To the contemporary conservative, progressive ideology is often murky and incomprehensible. It is very difficult for some on the right to understand the apparently illogical and unrealistic machinations of the radical leftist mindset. Their political objectives, if achieved, inevitably lead to further demands for concessions toward an ever-greater ideological purity. Something even darker and more malevolent is happening, however. The various radical leftist factions and special interest groups are rapidly coalescing into a global movement.
There is a link to an article ''Purifying the World: What the New Radical Ideology Stands For'' here:
It's 85+ pages and something to read over the weekend.
Also read: "Liberty and Tyranny" by Mark Levin available at www.marklevinshow.com