Please forgive me; the one I remember the most clearly was a case that came up when I was in high school, around 1975 or so. It was in New York state, a law mandating informed consent (I believe that its intent was to inform potential abortion clients about fetal development; pretty basic stuff). I'm fairly sure it was the SCOTUS that struck it down on the basis that either it "interferes with a woman's right to choose" or it "violates the right to privacy." Every once in a while, I hear or read about another similar law being stricken down, for about the same bogus reasons.
I am very sorry I do not have more concrete information; I do not keep newspaper articles on the subject and I am not a lawyer, so I wouldn't even know where to begin to conduct a legal database search on such a subject.