O'BRIEN v. United States

granting certiorari and vacating conviction where, in response to petition for certiorari, Solicitor General informed Court that electronic surveillance of attorney-client conversations had taken place | involving use of electronic surveillance installed in a commercial establishment to monitor conversation of suspect | granting certiorari and vacating conviction where, in response to petition for certiorari, Solicitor General informed Court that electronic surveillance of attorney-client conversations had taken place | although they were not revealed to prosecutors, governmental interception of conversations between a defendant and his lawyer required vacation of convic tion | although they were not revealed to prosecutors, governmental interception of conversations between a defendant and his lawyer required vacation of conviction | a listening device was planted in the business establishment of an acquaintance of accused after indictment | a listening device was planted in the business establishment of an acquaintance of the accused after indictment | although they were not revealed to prosecutors, governmental interception of conversations between a defendant and his lawyer required vacation of conviction