Free Speech Center at Middle Tennessee State University ↑ Thornburgh v. Abbott, 490 U.S. 401 (1989). ↑ Volokh 2008, p. 490 ↑ Bridges v. Wixon, 326 U.S. 135, 148 (1945). ↑ Kleindienst v. Mandel, 408 U.S. 753 (1972). ↑ Volokh 2008, p. 498