Academic freedom in a plain brown wrapper

In NRO's Corner, Stanley Kurtz reveals that members of the National Association of Scholars -- professors who support academic freedom and oppose political correctness -- now have a virtual catecomb, in the form of a weblog, for their mutual encouragement. Meanwhile NAS members receive printed communications in a plain brown wrapper:

When I was a grad student, I was afraid to join the NAS for fear that if my membership were discovered, it would destroy my career. So I subscribed to Academic Questions, the NAS journal, but without formally joining. Eventually, I joined the NAS, but made sure it mailings came to me at home, rather than at school. Turns out the local NAS understood all this, and sent its information in envelopes with no organizational identification on the outside.