Because of the last paragraph of this seriously bogus article. The banner was indeed posted and then a nice guy from the CIA office went across the hall and pointed out that while access from the central section with the elevators was controlled (with a Medco lock in the case of MIT's space, not that it was that difficult to get a copy of it), the bathrooms had no such protection, you only had to get past the guard on the ground floor and sign in (a necessary precaution due to the very bad neighborhood Tech Sq. was next to).
So that given that there are people out there who really hate the CIA, if someone were plant a bomb in one of the bathrooms it might very well be an MIT person who "found" it. The banner (in LOGO lab space?) was immediately taken down.
The CIA did not leave; they told MIT they'd be happy to if MIT would pay for replacing their built into the structure safe, which MIT was never willing to do.
seems like a good match if you want to recruit people who are into secrecy. if you want to recruit potential spies, you don't want your foreign intelligence agencies noticing who you are recruiting, do you?
If foreign agents are moving with impunity in the US and watching recruitment operations without anyone knowing I think the CIA/FBI has a bigger problem than recruitment.
Anyway, this still doesn't explain why I can't find another source that supports this article.
