Also – Not all courts agree, e.g.,

Public university professor does not have a First Amendment right to expression via school's grade assignment procedures; because grading is pedagogic, the assignment of the grade is subsumed under the university's freedom to determine how a course is to be taught. Brown v. Armenti 247 F.3d 69 C.A.3 (Pa.),2001.(In the classroom, the University is the speaker and the professor is its agent for first amendment purposes).