Nope, it doesn't. But that's the most prominent threat at present. There's anti-government anarchist groups, sure, but they're a much, much smaller threat. Muslim radicals are an exponentially greater threat.
Also, included in the bill is this line, which you didn't mention:
Any measure taken to prevent violent radicalization, homegrown terrorism, and ideologically based violence and homegrown terrorism in the United States should not violate the constitutional rights, civil rights, or civil liberties of United States citizens or lawful permanent residents.
But this is why it won't work, it also includes this line:
Certain governments, including the United Kingdom, Canada, and Australia have significant experience with homegrown terrorism and the United States can benefit from lessons learned by those nations.
Right, then. So, listen to the UK, which appeases non-assimilating violent groups within at every opportunity and disarmed its citizens, Canada, which actually debated allowing Sharia law and can't even keep the Russian mafia from nearly running Toronto, now, and Australia, which disarmed its citizens and has "homegrown" sorts calling women "whores" and attacking them for "dressing immodestly".
Yeah, that's good people to listen to.