Full at http://cheapmotelsandahotplate.org/2012/08/09/a-fan-letter-to-alex-cockburn/
"I first corresponded with Alex Cockburn in 1986. An article of mine titled, “South Africa, Anti-communism, and Value-Free Science” had appeared in The Chronicle of Higher Education and created a stir. One of the irate letter writers was Sidney Hook, the philosopher and former Marxist turned ardent right-winger. Among other things, Hook said that he couldn’t imagine how such a fool as I had been granted tenure. After reading Hook’s (dis)missive, I wrote the following to Alex, addressed to him c/o The Nation:"