Conversion Performed by Ha-Rav Shlomo Goren

Q: I heard that the conversion performed by Ha-Rav Goren (called the "Brother and Sister") was not according to Halachah.
A: Lies and deceit. His responsum was published and you can learn it (After Ha-Rav Goren's ruling in this matter, a broadside containing terrible vilifications was written against him. Our Rabbi Ha-Rav Tzvi Yehudah asked that the responum be brought to him. He looked at it and sent it to Ha-Rav Avraham Shapira. He did not ask whether he agreed with it or not, but whether it was well-built, like a serious halachic responsum. When Ha-Rav Shapira responded in the affirmative, our Rabbi proclaimed: "May the hands of those who perform evil be cut off." When he was asked: But aren't there great Rabbis among those who signed the broadside? He responded: "There are differences," i.e. not everyone criticized in an evil way. Iturei Yerushalayim #20.
And Ha-Rav Yosef Eliyahu Henkin, leading Posek in America before Ha-Rav Moshe Feinstein, never supported the ruling itself since he was blind at the time and was unable to learn it. He was adamant, however, that it was forbidden to argue with Ha-Rav Goren since he was a "Gadol Ha-Dor" (one of the great Rabbis of the generation). And he brushed off all claims against him. When Ha-Rav Henkin was told that some claimed that Ha-Rav Goren was in the category of one who takes a bride, he answered forcibly: "This is politics, not Halachah." And although he received much pressure from other Rabbis, he did not change his mind. Shut Bnei Banim vol. 2, p. 210).