Don't forget L. S. Vygotskii, who can also be found on that site, although I think he was more of a Pavlovian than a Marxist.
When it comes to gurus of the teaching profession, I prefer traditionalists such as Gilbert Highet, William C. Bagley, Arthur Bestor, Jacques Barzun, Mortimer Smith, and E. D. Hirsch.
Aren't Hillary and her gang devotees of that Italian socialist by the name of Gramsci who had his own spin on marxism/communism?