Of course it did not start here - it's been going on far longer than this, little by little - but we have to start SOMEWHERE and we will start with The Patriot Act. Then came the National Defense Authorization Act. Now comes this: The Enemy Expatriation Act. Now not only can you be classified a domestic terrorist for participating in a sit-in or other forms of Constitutionally-protected protest (The Patriot Act) and be detained for it indefinitely after the military kicks in your door and arrests you (The NDAA), you can also be stripped of your American citizenship (The Enemy Expatriation Act).
http://www.naturalnews.com/034661_Enemy_Expatriation_Act_citizenship_America.html
There is a link to the bill [H.R. 3166] in that article.
One or two more pieces of legislation and we will have virtually no rights as American citizens.