Analysis of the sophistry of Noam Chomsky on 9/11

Gatekeeping is the term used to describe the process of deciding which information will go forward and which will not. It is to be expected that the mass media/corporate/government triumvirate are strict and vigilant gatekeepers but what is puzzling, to me at least, is that certain progressive intellectuals, who are generally very critical of that triumvirate and who are regarded as important voices in keeping its members to account, also practise gatekeeping but only on a few, though vitally important, issues.