“I too can't see anyone else allowed into their home let alone” -- their bedroom and “anyone involved in Corleone security” would really have no business? being inside their Boss' bedroom So my take too, that leaves only Fredo -- only "Roth's inside man Fredo did it

Fredo undoubtedly knew "about the Senate hearing" which Fredo "deliberately and deceitfully concealed even after his betrayal, the Tahoe shooting then cunningly withheld" the information from Michael -- Michael prison Fredo Don

“married a woman like Kay” No kidding! -- Horror Kay Biggest hypocrite

Fredo is running the brothels but Geary is the one having all the fun!