I saw Horowitz on the CSPAN sunday night book show talking about Radical Son. I bought the book in Newark airport and finished it before we landed in Houston. A great read. He really was involved with some bad stuff.
That was what I got from it too. I think one of the key things that changed him from a Leftist to a conservative was his exposure to the Black Panthers, and the open criminal mindset...culminating in the murder of Betty Van Patter, a secretary who somehow crossed someone.
Great read. Also, the whole concept of the Communists in this country who socialized with each other, vacationed with each other, and so on.
Can you imagine? Joseph McCarthy was indeed right. There WAS a Communist infestation.