 His most frequent ally on the Court (the pair rarely voted at odds) was Justice William Brennan, who consistently joined him in supporting abortion rights and opposing the death penalty.Brennan and Marshall concluded in "Furman v. Georgia" that the death penalty was, in all circumstances, unconstitutional, and never accepted the legitimacy of "Gregg v. Georgia", which ruled four years later that the death penalty was constitutional in some circumstances.Thereafter, Brennan or Marshall dissented from every denial of "certiorari" in a capital case and from every decision upholding a sentence of death.