On Dissent: Its Meaning in America By Ronald K..L. Collins and David M. Skover Cambridge University Press Hardback $24.99, Amazon $18.95 200 pages June 2013 For all that has been said about dissent—in books, articles, judicial opinions, and in the popular culture—it is remarkable that no one has devoted much, if any, attention to explaining what dissent is or what we intend to convey when we invoke it.