California Lawyer (November 2011) has an excellent interview with Justice Ruth Ginsburg. Below is my favorite part:
Perhaps, at least in a peaceful society, all good things come to those who wait? I've sometimes wondered whether the Supreme Court's decision upholding Muhammad Ali's conscientious objector status would be the same if the case had arrived at the Court a few years earlier. In one article I read--it was from Men's Journal (Nov 2011)--the author wrote that the Supreme Court was set against Ali until a law clerk gave them a copy of Haley's Autobiography of Malcolm X. After reading the book, the Court allegedly had a change of heart. True or not, the anecdote demonstrates that the law, so long as it relies on interpretation by men and women, necessarily intersects with their bias.
In any case, regarding the efficacy of the Constitution against government tyranny--whether slavery, Jim Crow, Japanese internment camps, Abu Ghraib, etc.--I'll leave you with this Lysander Spooner quote: "But whether the Constitution really be one thing, or another, this much is certain--that it has either authorized such a government as we have had, or has been powerless to prevent it." [Updated on 3/25/12]
Bonus: see also "When Mass Murder and Theft of All Human Rights Were 'Legal': The Nazi Judiciary and Judges," by Hon. Richard D. Fybel, California Litigation, Vol. 25, No. 2, 2012, page 15-21. He discusses Nazi Germany and the judicial branch's politically-convenient prostration before Hitler.