This article focus on maybe the most striking judicial case in America during the early twenieth century. The Sacco and Vanzetti case. There is a widespead awareness about the crime they were accused for, the trial phases and their tragic end, but what about the defensive strategies adopted by their lawyers? The analisys of this theme and the involvement of the pubblic opinion demostrates how this jucidial case bacame an affaire, with a disrupting international eco, underestimated even by U.S. authorities. The pubblic opinion will elevate the two anarchists, crushed by injustice and the political trial, to icons of political struggle against the system.