There is an interesting anecdote of Chomsky's appearance at the Sociobiology Study group, by Segerstråle in her sanctimonious and lopsided book, that list-members may find interesting (especially since it even mentions Marx!). I can't find a cut-and-pasteable version, but will post relevant bits (~ page 200, Defenders of Truth, 1st ed) when I can. You can also look it up in Google books.
--ravi