I read the original exchange [http://thefire.org/article/13592.html], as well as the linked article. From that I get the following:
1. The Campus Police saw a poster on a bulletin board near and removed it due the the reference to killing.
2. They notified Professor Miller that he or someone had posted it and they removed it due to the reference. They asked him to contact them with questions
3. He exploded at them about first amendment rights and called them fascists.
4. They asked to sit down with them and go over the problem and informed him of campus requirements. They also let him know that if he violated campus requirements there may be penalties.
5. He called them "card carrying members of the NRA who are wearing side arms and truncheons" and put up a poster again calling them fascists.
6. The CP contacted his boss who asked him to meet with him ASAP.
7. He went crying to the media about how his rights are being trampled by fascists.
It seems to me that if he had simply talked rationally about this from the start (after the poster was removed) this whole problem could have been avoided. While the Campus Police may have gone too far enforcing campus rules, the prof went way out in the deep end without any concern for sanity.
Nothing the CP did was a terrible fascist crime, if Professor Miller had bothered to think before screaming, this would have been a non-issue.