CITES BY TOPIC:  unlawful

Black's Law Dictionary, Sixth Edition, p. 1536

Unlawful.  That which is contrary to, prohibited, or unauthorized by law.  That which is not lawful.  The acting contrary to, or in defiance of the law; disobeying or disregarding the law.  Term is equivalent to “without excuse or justification.”  State v. Noble, 90 N.M. 360, 563 P.2d 1153, 1157.  While necessarily not implying the element of criminality, it is broad enough to include it.

[Black's Law Dictionary, Sixth Edition, p. 1536]

See also "illegal"

Western Union Telegraph Co. v. Foster, 247 U.S. 105, 38 S.Ct. 438 (1918):

"Acts generally lawful may become unlawful when done to accomplish an unlawful end.  United States v. Reading Co., 226 U.S. 34, 357, 33 Supp.Ct. 90, 57 L.Ed. 243, and a constitutional power cannot be used by way of condition to attain an unconstitutional result...The regulation in question is quite as great an inteference as a tax of the kind that repeated decisions have held void.  It cannot be justified 'under that somewhat ambiguous term of police powers." 

[Western Union Telegraph Co. v. Foster, 247 U.S. 105; 38 S.Ct. 438 (1918)]