National Defense Authorization Act for Fiscal Year 2012
The president may now use the military to imprison anyone associated with a dangerous group, in secret, without access to an attorney.
As always, governments are the greatest danger to their citizens. I fear a government responding to a subversive message (such as this blog post) much more than I fear a religious zelot in a remote part of the world wearing a homemade explosive belt. The latter are in relatively short supply, poor, and disorganized. The former are ubiquitous, the most economically powerful entities in existence, and highly organized.