Take a look at his beliefs...his actions...his causes..and now he's kicked out of the left because he feels they've gone too far.
My problem with Horowitz is that he was a doctrinaire thug a generation ago and he's a doctrinaire thug today. The doctrines have changed, but tactically he remains a Stalinist. You, of course, are too witlessly young as yet to grasp this.
cordially,