Everyone's like "it won't happen" but I remember post-9/11 a specific Linux news site got hit with claims of radicalism and some folks who frequented the site got put on watch lists. For interest in Linux.
There was a reason folks like me were against all the surveillance from the PATRIOT Act back then, and this is why.
EDIT:
Similarly, the Bush admin had the FBI spying on Quakers, the only religious group that anti-violence is such a central tenet to their religion that they by default are considered conscientious objectors and cannot be drafted into the military without violating their beliefs.
Post-9/11 the government thought peaceful Quaker anti-war activists were dangerous.
That was post-9/11 in the War on Terror years... It can happen here.
Sources:
Linuxjournal gets "extra surveillance:"
Quakers being spied on by FBI: