The university’s move to dismiss Mr. Tracy came days after a clash that the professor had with Lenny and Veronique Pozner, the parents of a 6-year-old boy murdered at Sandy Hook, in the online opinion section of The Sun-Sentinel.

On Dec. 10, the paper published an article by the Pozners condemning Mr. Tracy as a driving force in the Sandy Hook conspiracy movement, a group responsible for “a wave of harassment, intimidation and criminal activity against our family and others.”

“They seek us out and accuse us of being government agents who are faking our grief and lying about our loss,” they wrote.

Their article recounted a clash with Mr. Tracy in March. Mr. Pozner had demanded that Mr. Tracy remove a photograph of their murdered son, Noah, from his blog, Memory Hole. Mr. Tracy responded with a certified letter demanding proof that Mr. Pozner was Noah’s father.