http://www.slate.com/articles/life/education/2015/07/a_wisconsin_professor_tweeted_at_students_about_scott_walker_s_higher_ed.html

Sara Goldrick-Rab is a tenured professor of sociology and education policy at the University of Wisconsin–Madison. She is an outspoken public scholar with a prolific social media presence, and she is devastated about Wisconsin Gov. Scott Walker’s recent changes to tenure and shared faculty governance at her place of employ. For several months, as Walker’s agenda has turned from talking points to reality, Goldrick-Rab’s Twitter feed has become a juggernaut of links to news articles, document explication, and 140-character cannon fire. Her most controversial tweet compares the psychological profiles of Walker and Adolf Hitler. She has put into very public practice the exercise of the exact academic freedom whose death she foretells. And she can, because she has tenure—for now.