When Brazil's Supreme Court ruled in the case of Sigfried Ellwanger ­- an editor, author, and notorious Nazi sympathizer - it entered the perilous field where free speech and efforts to contain racism meet. For years, Ellwanger published anti-Semitic books, such as The Protocols of the Elders of Zion, as well as books of Holocaust denial, such as his own Jewish or German Holocaust: Behind the Lie of the Century.