I concur in the reversal and remand for further proceedings, but I would make it plain that a hearing is required if the government denies the petitioner’s allegation that an Assistant United States Attorney promised him that he would recommend a suspended sentence. See Walker v. Johnston, 312 U.S. 275, 287, 61 S.Ct. 574, 85 L.Ed. 830 (1941); United States v. Hayman, 342 U.S. 205, 223, 72 S.Ct. 263, 96 L.Ed. 232 (1952); United States v. Paglia, 190 F.2d 445, 448 (2d Cir. 1951).