Every college campus on this country has its own share of spooks, reporting to the various security agencies in the country; Harvard is certainly not alone on this.

It appears to be an attempt to put a chill on the freedoms of both speech and assembly for campus activists, and that is just the design intent.
http://www.usnews.com/blogs/paper-trail/2008/04/15/aclu-accuses-harvard-of-ties-to-the-fbi.html