The New Left wasn't destroyed by the Right-- it collapsed of its own infighting. Sure COINTELPRO contributed, but the 70s and even the 80s was not McCarthyism. The Right were just smarter organizers.
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CB: Since the Old and New Left were such "failures", why are you on the Left ? What makes you think you can succeed where they "failed" ? It seems that your current Left perspective is that the Left should support "imperialism" where Saddam, Milosovec and Bin Laden are its opponents. I take it that's the lesson you learned from the failures of the Old and New Left opposing imperialism: If you can't beat 'em; join 'em.