em.Snowden???s disclosures created tension between the U.S. and some of its close allies, revealing that the U.S. had spied on Brazil, France, Mexico, Britain, China, Germany and Spain as well as 35 world leaders, most notably German Chancellor Angela Merkel, who said ???spying among friends??? was ???unacceptable??? and compared the NSA with the Stasi.The NSA???s top-secret ???black budget??? exp