The letters &quot;NSA&quot; for National Security Agency and a mask of U.S. whistleblower Edward Snowden are taped on a fence of the &quot;Dagger Complex&quot;, which is used by U.S. Army intelligence services, during a demonstration against the NSA and in support of Snowden in Griesheim, 20km (12.4 miles) south of Frankfurt, July 20, 2013.(Reuters / Kai Pfaffenbach)