Must We Obey a Law Just Because Congress Says So?

.....Not according to the Supreme Court.in 2014. I briefly discuss it here.

"An unconstitutional law cannot operate to supersede any existing valid law.

"Indeed, insofar as a statute runs counter to the fundamental law of the land, it is superseded thereby.

No one is bound to obey an unconstitutional law and no courts are bound to enforce it.

— Sixteenth American Jurisprudence, Second Edition, Section 177. (late 2nd Ed. Section 256)"