First, a bit of context. RAW's Chaos and Beyond, a pretty good book which the RAW estate has inexplicably allowed to go out of print, includes a RAW essay, "Jury Nullification: Freedom's Last Chance." The lead paragraph says, "An old idea has resurfaced that may have major potential to slow or even reverse the terrifying erosion of the Bill of Rights under the Reagan-Bush Team and their right-wing Supreme Court. I refer to the revival of the ancient Saxon doctrine of Jury Nullification which has not become a projected Constitutional amendment under consideration in 22 states." (The book, dedicated to Robert Shea, was published in 1994).
From Reason's Web site: A jury in Kansas rebels against a marijuana prosecution and forces the dismissal of the case. (I missed the original posting, so thanks Nick Helweg-Larsen.)
In that 1990s essay, Wilson urges his readers to write to an organization in Montana named FIJA that backs jury nullification rights. An Internet search reveals that the Fully Informed Jury Association is still going strong and still maintains a headquarters in Montana, although it offers contact information for supporters in other states.
UPDATE: In the comments, anonymous notes that the RAW essay I mention is available online.