Answer:
Gideon v. Wainwright
Explanation:
The importance of the Gideon ruling is that it is of historical interest, and relevant to appreciating the constitutional protections available to citizens. Prior to the Gideon ruling, the Supreme Court had decided several other cases relating to the right of counsel; nearly all such cases had involved the death penalty. Gideon extended the right to counsel to non-capital cases as well.