How Hate Speech and Extremism Went Mainstream Listen Download Embed Share Share this on Facebook (Opens in a new window) Share this on Twitter (Opens in a new window) Share this via Email A member of the Ku Klux Klan salutes during American Nazi Party rally at Valley Forge National Park September 25, 2004 in Valley Forge, Pennsylvania. ( William Thomas Cain / Getty ) Produced by Arwa Gunja Produced by PRI and WNYC