Stephen F. Rohde, Chair of the ACLU Foundation of Southern California, holds the distinction of having confronted John Yoo twice [link to article below].
In Los Angeles, on June 26th-UN International Day in Support of Victims of Torture, [Rohde moderated] the "Reckoning with Torture" presentation organized by the National Religious Campaign Against Torture, [where] the focus was on torture as evil, something that simply cannot and must not be allowed under any circumstances-even if in some as yet unknown universe it were to demonstrate actual utility...
see Diane Lefer's account of event here