Illegal Law
An Illegal law is a law that that contradicts and or breaks the content/authority of a higher law, thus causing it to be illegal.
The NDAA is a new law that allows the detainment of Americans indefinitely. There is no warrant required for this detainment to take place and no speedy trial or hearing allowed. This law clearly breaks the 6th amendment in every way possible, thus causing it to be an illegal law since the Constitution is of higher authority and the Supreme Law of the Land.