Please provide evidence for your claim.
This is common knowledge, see the post #21 (which was taken from Wikipedia...I know...I dislike Wikipedia, but it is a good source of quick, and to some degree, accurate info)
I know that in his current life, it is difficult to evision him has a Trotskyite or a Soviet Lover, but he did write for The Nation, and was at one time a committed leftist.
To be fair, I had never paid him much attention until he began speaking out against Saddam Hussein, that was all I ever knew of him up to that point. It was only when I began praising him that people pointed out his nefarious past to me...:)
If I met him now, I would shake his hand, though...I tend to view him kind of the same way I view David Horowitz, but...David Horowitz had an utter and complete break with the philosophy of the left...Hitchens apparently has not.