Although probably not the best introduction to Foucault and Chomsky's thought (though Chomsky does tend to follow a more linear position), this debate is more indicative of their respective approaches to the social sciences. As Chomsky posits a kind of communitarian society or set of cosmopolitan social relations, Foucault questions the institutions that individuals are embedded within as a kind of power structure bent on maintaining the status quo and controlling those elements of society in "need" of coercion. He goes further and suggests that all state institutions, down from the clinic and police station to the seemingly "benign" institution of the university are actually in need of interrogation (through language, through discourse) to determine how they ultimately maintain and enforce a certain cet of power relations. Their approaches are different, for example Foucault rarely answers questions but asks his own, but most noticeable in these debates are Chomsky's poise and Foucault's incendiary violence in words. Enjoy!