Many groups have claimed that the NSA’s surveillance program is an unconstitutional violation of privacy. But a different type of challenge is growing teeth. Led by civil liberties group the Electronic Frontier Foundation, more than 20 organizations, with interests ranging from marijuana to guns, are currently suing the federal government. They believe the NSA surveillance program has a chilling effect on speech, thus violating the First Amendment. It’s difficult to prove this, though. There’s no way to quantify the students who don’t join their college’s “legalize marijuana” club, or the number of Arab-Americans who avoid political topics via email. Absences...