You seem to have received a Cease & Desist notice which is without basis.
The ‘Chilling Effects’ database collects such curiosities.
For example, this notice hosted by Chilling Effects http://www.chillingeffects.org/protest/notice.cgi?NoticeID=33101 originates from an educational institution in the same country as GSTF and has similar Google colors (which may all just incidental).
That C&D has been filed under the category ‘protests’, which is to say that it attempts to ‘chill’ digital protests. In your case it would be categorized differently, of course.
When there is no basis, you shouldn’t have to self-censor. In the example case, the protest site http://www.forabettergiis.blogspot.com/ remains readable despite the C&D notice.
